Saturday, 27 June 2026 01:20 PM
Advertorial
As interest in cardiovascular wellness and nitric oxide support continues rising in 2026, this The 20 Flow review explores the brand-stated organic ingredient profile, how FLOW is positioned to support healthy circulation routines, and what buyers are rechecking before subscribing.
SHERIDAN, WY / ACCESS Newswire / June 27, 2026 / Disclaimers: The free-bottle offer caught your eye - and this review has everything you need before you decide. Paid advertorial, affiliate commission on purchases through links here. Claims attributed to The20, LLC. FLOW is a dietary supplement - not a drug, not FDA-approved, not intended to diagnose, treat, cure, or prevent any disease. Promotional content. Last verified: June 2026. Official site: the20.store. Phrases like "organic blood flow supplement" and "organic watermelon-derived L-Citrulline" are The20, LLC's own marketing language, sourced from the20.store. This article independently verified what could be verified - and flags what couldn't. Keep reading for the full picture.
View Current FLOW Subscription Terms at The20's Official Subscription Page
The 20 Flow Consumer Research 2026: Reviewing What Buyers Should Verify Before Ordering the Nitric Oxide Support Supplement
TL;DR | Last Updated: June 2026 - FLOW Nitric Oxide Booster is a cardiovascular supplement from The20, LLC, formulated to support nitric oxide production and blood flow using organic food-derived L-Citrulline from watermelon, organic spinach, acerola cherry, and pine bark extract - a cleaner ingredient stack than most of this category. First bottle free, pay shipping only, then $22.47 per month. Three things worth confirming before you check out: the subscription lander and The20's own Terms of Service list different return windows (364 days vs. 90 days - only the brand can clarify which governs your order); per-ingredient dosages aren't publicly disclosed; and the return address differs across two brand pages. All three are resolvable with one call to the brand before you subscribe. This article covers all of it.
You Saw an Ad for FLOW - Here's What to Do Before You Subscribe
You saw an ad for FLOW Nitric Oxide Booster. Maybe it was on Facebook, maybe Instagram, maybe a short video featuring a woman talking about blood flow and energy and what happens to your circulation as you age. Something caught your attention - probably the angle that this formula is built from real organic foods instead of synthetic lab compounds - and now you're doing exactly what smart buyers do: checking the details before you hand over a credit card number to a subscription.
That's the right call. And here's context worth having before you decide: nitric oxide is the molecule your blood vessels use to regulate blood flow - and its production declines at a documented rate after 40. According to research The20 cites on its own product pages, most people are working with roughly half the nitric oxide production at 50 that they had at 20, which translates directly to reduced blood flow support across every system that depends on it. That's the underlying biology behind why this supplement category exists, and it's also why this article is worth reading before you check out. You'll find exactly what's confirmed about FLOW, what isn't publicly disclosed, where The20's own pages contradict each other, and what to verify before the subscription starts.
What Is FLOW Nitric Oxide Booster and Who Is It For?
FLOW Nitric Oxide Booster is a dietary supplement from The20, LLC, a wellness brand co-founded by Susan Bratton and Tim Bratton. Susan Bratton is a wellness educator and author who has built a significant following in the healthy aging and vitality space - her podcast, books, and educational programs focused on circulation, energy, and longevity have reached an estimated 40 million readers and listeners, according to her own bio materials. She's not a physician, and The20 doesn't position her as one. What she is, according to the brand's own materials, is someone who has spent years researching what the science actually says about how the body ages and what nutritional support can address that. FLOW is built on that research framework.
The brand's stated positioning is cardiovascular and circulatory support - specifically, supporting the body's natural nitric oxide production, which the brand says declines significantly after age 40. Susan Bratton is the primary public voice behind The20 and the face of FLOW's marketing, which means the reader who saw a FLOW ad almost certainly saw her presenting it. That context matters: you're evaluating a product from an educator-founded brand, not a pharmaceutical company. Different standards of evidence apply, and the article applies them throughout.
The product's distinguishing claim, according to The20's own marketing, is the source of its key active compound. Most nitric oxide supplements use synthetic L-Citrulline or L-Arginine derived from corn fermentation. The20 says FLOW uses L-Citrulline extracted from organic watermelon - the amino acid for which watermelon (Citrullus vulgaris) was originally named. That sourcing choice, according to the brand, is intended to address concerns some consumers have about ingredient origin and agricultural practices in bulk amino acid manufacturing.
The brand describes the target user as any adult over 40 who wants cardiovascular circulation support, better energy, sharper cognitive function, and support for overall vitality. According to the brand's own FAQ, FLOW is formulated for all adults across the gender spectrum - men, women, and non-binary individuals.
One thing worth being clear about upfront: FLOW is a dietary supplement in the cardiovascular and circulation support category - not a prescription drug, not FDA-approved for any medical condition, and per the brand's own disclaimer, not intended to diagnose, treat, cure, or prevent any disease. That framing governs every claim in this article and every claim The20 makes on its own pages.
View Current FLOW Subscription Terms at The20's Official Subscription Page
Disclosure: If you buy through this link, a commission may be earned at no extra cost to you.
What Does FLOW Actually Do? The Cardiovascular Science Behind the Formula
The20 says FLOW works through two separate nitric oxide production pathways in your body - and that most nitric oxide supplements only work through one. Here's what that actually means in plain English.
Your body produces nitric oxide two ways. The first is through your blood vessel lining - the endothelial pathway. When you take L-Citrulline, your body converts it into L-Arginine, then into nitric oxide right inside the walls of your blood vessels. That nitric oxide relaxes the smooth muscle tissue in those walls, which may support healthier circulation. The L-Citrulline in FLOW comes from fermented organic watermelon - that's the actual fruit, not a synthetic lab compound.
The second pathway is through your saliva. When you eat foods rich in dietary nitrates - like spinach - bacteria in your mouth convert those nitrates into nitrites, which then become nitric oxide. FLOW includes organic spinach for exactly this reason. The brand chose spinach over beet root because most commercial beet supplements use genetically modified beets and only hit this one salivary pathway. The brand's position is that you get both.
Rounding out the formula: organic acerola cherries for Vitamin C, which the brand says enhances citrulline absorption based on published research it cites on its product page. And pine bark extract (Pinus pinaster), which the brand references for its circulatory effects - specifically citing a Japanese study suggesting it may support blood flow through its antioxidant tannin compounds.
Confirmed full ingredient list from brand pages and a verified Amazon product listing (ASIN B085DHHRS1), as of June 2026: organic watermelon (L-Citrulline source), organic spinach (dietary nitrates), organic acerola cherry (Vitamin C), pine bark extract (Pinus pinaster), N-Acetyl-Cysteine, organic rice flour (excipient), tapioca starch (trace). Gelatin capsules - not vegan or vegetarian.
One flag worth knowing: N-Acetyl-Cysteine (NAC) appears in the Amazon listing for FLOW. The FDA has had an ongoing regulatory position that NAC can't be marketed as a dietary supplement ingredient in certain contexts. If that matters to your decision, reach out to The20 directly - [email protected] or +1 (307) 240-6862 - and ask how they address NAC's status in this formula before you order.
The "Organic Blood Flow Supplement" Angle: What the Brand Claims and What It Means
The phrase "organic blood flow supplement" - used in The20's own marketing and reflected in this article's title - is the brand's characterization of FLOW's formulation approach, not an independently verified ranking or a regulatory classification. Here's what it actually means in practice.
The brand says FLOW is the first nitric oxide supplement built from organic fruits and vegetables, not from synthetic compounds. That's what's behind the "organic blood flow supplement" framing - and here's what it actually means before you decide if it matters to you.
Most of the L-Citrulline and L-Arginine powder found in supplement products comes from a fermentation process using corn. The20 states that its sourcing approach is intended to address concerns some consumers have about ingredient origin and agricultural practices - specifically, that its supplier ferments actual organic watermelons to extract L-Citrulline, and sources organic spinach for the dietary nitrate component. The brand frames this as a real-food foundation rather than a commodity amino acid powder.
Is that better? The20 believes so, and the logic is consistent - if ingredient origin and agricultural practices matter to you, organic food-derived sourcing addresses those concerns directly. What the brand can't prove - and doesn't claim - is that this difference produces measurably superior outcomes in a controlled trial against synthetic citrulline. Individual results vary, and the supplement isn't a drug.
The dual-pathway framing - endothelial plus salivary - is the other angle worth unpacking. Most beet supplements work only through the salivary pathway (nitrates → nitrites → nitric oxide in the mouth). FLOW adds watermelon-derived L-Citrulline for the endothelial pathway (citrulline → arginine → nitric oxide in blood vessel walls). Two separate production routes for the same molecule. Whether that doubles the effect in practice isn't something this review can verify - but the mechanism is grounded in real cardiovascular science, not marketing fiction.
What the Research Says About the Active Compounds in FLOW
Let's be straight about what "research" means here. There are no published clinical trials on FLOW as a finished product that this review could verify. What exists - and what The20 cites on its product pages - is ingredient-level research on the individual compounds. That distinction matters, and every claim in this section stays at the ingredient level.
L-Citrulline and blood flow
L-Citrulline is the most research-supported compound in the formula for blood flow and cardiovascular support. A 2025 systematic review and meta-analysis published in Frontiers in Nutrition - examining randomized controlled trials in middle-aged and older adults specifically - found that L-Citrulline supplementation and watermelon intake showed positive effects on arterial stiffness and endothelial function, which are key markers of healthy blood flow and vascular aging. A separate meta-analysis in a peer-reviewed clinical nutrition journal found that longer-term L-Citrulline supplementation improved brachial artery flow-mediated vasodilation in human trials. The mechanism is established: L-Citrulline bypasses the liver, travels to the kidneys where it's converted to L-Arginine, and L-Arginine then serves as the substrate for nitric oxide synthase - the enzyme that produces nitric oxide in endothelial cells, supporting blood vessel relaxation and healthy blood flow. The brand cites two specific studies on its product pages supporting its citrulline positioning, consistent with this published record. L-Citrulline has been used safely in published clinical trials in both adults and children, and the brand cites self-affirmed GRAS status - a manufacturer-level safety determination, distinct from FDA approval.
One dosage note buyers should know
Published studies examining L-Citrulline's effects on blood flow and vascular function typically use doses in the 3-6 gram daily range. FLOW's total proprietary blend is 850mg per serving - and L-Citrulline is one of several ingredients in that blend, not the full 850mg. The per-ingredient amount isn't publicly disclosed. This doesn't mean FLOW's citrulline content is ineffective - lower doses may still provide meaningful blood flow support for some individuals - but it does mean you can't independently compare it against the specific doses used in the published trials the brand's marketing references. If that comparison matters to your decision, ask The20 directly what the citrulline content is.
Dietary nitrates from organic spinach
The salivary nitrate-to-nitric oxide pathway is a well-documented mechanism in cardiovascular research. Spinach is a high-nitrate food, and published research confirms dietary nitrates from leafy greens can improve flow-mediated dilation and support healthy blood flow parameters in human trials. The mechanism is real - the question of whether the specific amount in FLOW's proprietary blend reaches a clinically relevant threshold is something the undisclosed per-ingredient dosage makes impossible to assess independently.
Vitamin C from organic acerola cherry
The brand cites a published study on combined L-Citrulline and antioxidant supplementation for the absorption-enhancement claim. Separately, published research suggests Vitamin C may support blood flow by helping preserve nitric oxide bioavailability and supporting endothelial function - a plausible synergy with the citrulline component. Acerola cherries are among the most concentrated natural Vitamin C sources available, which is the factual basis for the brand's sourcing choice here.
Pine bark extract (Pinus pinaster)
Published research on French maritime pine bark extract - often studied as Pycnogenol® in clinical trials - includes randomized controlled studies showing effects on circulation and cardiovascular health markers. A 2024 review cited in published literature summarizes beneficial effects on vascular function and physical work capacity. The brand references a Japanese study suggesting blood flow support. That research is on the ingredient class - not on FLOW specifically, and not on this particular source of pine bark extract.
The bottom line on the research
Published studies on these individual compounds don't prove that FLOW as a finished product produces the same outcomes at its specific doses. That's how supplement science works - ingredient research and finished-product clinical evidence are different things, and this article treats them as such. What the research does confirm is that every active ingredient in FLOW has a legitimate published rationale for supporting nitric oxide production and blood flow. That's more than most supplements in this category can honestly claim.
How to Take FLOW and What to Expect
Two capsules a day - that's the standard dose. Those two capsules deliver 850mg of the proprietary blend. Each bottle has 60 capsules, so you're looking at a 30-day supply if you stick to two per day. Simple.
The capsules are size 0 - the brand describes these as the smallest gelatin capsule that fits the full 850mg dose. No magnesium stearate in the formula, which is worth noting if you're particular about excipients. The organic rice flour used as a flow agent on the production line is present in minimal amounts. The brand says every batch is tested for gluten, molds, bacteria, and ingredient conformance - that's the brand's own representation, not an independently verified certification, since no specific third-party certification was confirmed from accessible pages.
One thing the brand includes on its lander that's genuinely worth reading before you order: "If you have a medical condition, are pregnant, lactating, trying to conceive, under the age of 18, or taking medications - especially blood pressure medications - consult your healthcare professional before using this supplement." That language isn't simply boilerplate. It reflects potential medication interaction considerations identified by the brand: L-Citrulline works on nitric oxide and vasodilation pathways that overlap with several classes of prescription cardiovascular medications, and stacking supplements with those drugs warrants a conversation with your doctor first.
Specifically: if you're taking blood pressure medications, organic nitrates, or phosphodiesterase inhibitors - or if you're on anticoagulants where pine bark extract could affect platelet function - get your doctor involved before you start FLOW. And if you have kidney or renal issues, L-Citrulline metabolism is relevant to kidney function specifically; the Amazon listing for FLOW flags this as a condition requiring medical clearance. Don't skip that conversation with your healthcare provider.
Buyer Takeaway: Two capsules daily, 850mg total blend, 30-day supply per bottle. Straightforward to take. The only complexity is the medication interaction question - if you're on any cardiovascular prescription, that conversation with your doctor happens before you order, not after.
What Does FLOW Actually Cost After the Free Bottle?
Subscription Pricing Explained
Two different landing pages, two different price structures - here's what's actually going on. The links in this article go to the subscription lander, which runs through ClickBank. The20's own store (the20store.com) has a separate set of options. Both are legitimate ways to buy FLOW. They just work differently.
Through the subscription lander (what you get clicking this article's links)
Your first bottle is free - you cover shipping only. After that, it's $22.47 per month, billed automatically, and bottles ship on your schedule. Cancel anytime by emailing [email protected] or calling +1 (307) 240-6862 - at least one business day before your next renewal date. Miss that cutoff by even a few hours and you're billed for the next cycle. The retailer processing the billing is ClickBank (Click Sales, Inc.). Order support: [email protected], US: +1 (800) 390-6035.
Through The20Store directly (the20store.com)
One-time purchase is $29.95 per bottle, no subscription commitment. Monthly subscription saves 25% at $22.47 per month.
Three bottles every three months saves 33% at $59.95 per quarter with free US shipping.
The economics here are worth being clear about: the free-bottle entry point is the lowest-cost way to evaluate FLOW - but only if you go in with the subscription terms locked down first. If you decide later to try it without the subscription, you'll pay $29.95 for the same bottle. That $7.48 difference is a real reason to decide sooner rather than later - provided you've confirmed the guarantee window and cancellation mechanics before you commit. A free trial that turns into an unwanted second billing cycle isn't a saving.
The shipping cost for the first free bottle isn't stated on the lander page itself - you'll see it at checkout. Confirm the all-in first-order cost before you complete the order.
For California residents: this is an auto-renewing subscription. California's automatic purchase renewal law (Business and Professions Code §17600) requires clear upfront disclosure of recurring terms. The brand provides cancellation instructions and subscription disclosures through its published policies. Consumers should review current terms before enrolling.
Confirm Current FLOW Pricing and Subscription Terms at The20's Subscription Page
What Is FLOW's Return Policy - and Why Do Two Brand Pages Give Different Answers?
The subscription lander makes a strong claim: return the unused portion within 364 days of purchase and you'll get a full refund minus shipping and handling. A near-year-long satisfaction window is unusual in the supplement space - and it's a genuine commitment if it's the policy that actually governs your order.
Here's the problem: it may not be. The brand's own refund policy page, Terms of Service, and The20Store's site-wide header all say 90 days. Three internal brand sources say one thing. The subscription lander says another. This publication flagged the conflict and can't resolve it - only The20 can tell you which window applies to a subscription order placed through ClickBank on that lander.
Here's the math that makes this worth resolving before you check out, not after: if the 90-day window governs your subscription order, the clock starts the moment you complete checkout - not when the bottle arrives, not when you open it. A typical first-time buyer spends one to two weeks deciding whether the product is working. That leaves somewhere between six and ten weeks to make a return decision. Most people don't think about this until they're past the window. Knowing which clock you're on before you subscribe takes one phone call. Not knowing costs you the protection entirely if the shorter window applies.
Before you subscribe: contact The20 at [email protected] or +1 (307) 240-6862 and ask that exact question in writing. "I'm ordering through the free-first-bottle subscription lander. Is my return window 364 days or 90 days?" Keep whatever answer you get. That's your documentation if you ever need it.
Return logistics add one more layer: the return address isn't consistent across brand pages. The ToS and refund page list The 20, 37 Inverness Drive East, Suite 100, Englewood CO 80112. The ClickBank lander footer shows EyeFive, Inc. c/o The20, LLC, 19655 E 35th Dr #100, Aurora CO 80011. Don't ship anything back until you've called or emailed the brand, obtained an RMA number, and confirmed the current return address. Returns without an RMA number visible on the outside of the box won't be processed per The20's own policy. You're responsible for return postage - the brand recommends UPS or insured mail, and notes it can't refund items that don't arrive at the warehouse.
Who Should Consider FLOW - and Who Should Check with a Doctor First
FLOW may be worth considering for:
Adults over 40 interested in cardiovascular circulation support as part of a broader wellness routine
Buyers who specifically want a nitric oxide supplement sourced from organic food-derived ingredients rather than synthetic lab compounds
People looking for a supplement that addresses both nitric oxide production pathways (endothelial and salivary) in a single daily capsule
Buyers who want a gluten-free, sugar-free, lactose-free, non-GMO option without L-Arginine or magnesium stearate
FLOW is NOT appropriate without medical clearance for:
Anyone currently taking blood pressure medications - L-Citrulline works on the same vascular pathways as many blood pressure drugs, and combining them without medical supervision poses real risk
Anyone on prescription cardiovascular medications including nitrates or phosphodiesterase inhibitors - same pathway interaction concern applies
Anyone taking anticoagulants or blood thinners - pine bark extract may affect platelet aggregation
Pregnant or lactating individuals
Anyone trying to conceive
Anyone under 18
Anyone with kidney or renal issues - L-Citrulline metabolism affects kidney function; the Amazon listing for FLOW specifically flags this
The brand itself flags medical consultation before use for any of the above conditions. That's not filler language - it reflects potential medication interaction considerations that your doctor needs to weigh in on, particularly around nitric oxide pathway overlap with cardiovascular prescriptions. Don't skip that conversation if any of these categories apply to you.
What Buyers Are Saying About FLOW
The subscription lander includes video testimonials from buyers. The accessible themes - not carrying the R12 language from the brand's page - center on energy levels, improved circulation sensation, and how quickly people noticed a difference. One buyer mentions noticing effects within a couple of days. Another focuses on the ingredient quality being the draw. These are real people sharing real experiences - they're also individual accounts, and what worked for them won't necessarily work for you.
Individual experiences vary and are not typical. Testimonials don't establish that FLOW will produce the same results for any other user. Don't rely on testimonials alone as proof of how a product will work for you - your results will depend on your own health, habits, and biology.
What you won't find here: a star rating or review count. The brand doesn't publish an aggregate rating with a disclosed platform and review count on its accessible pages - so this review doesn't report one. If you want to see independent reviews, ASIN B085DHHRS1 on Amazon has buyer reviews submitted outside the brand's own ecosystem.
The brand's Medical Advisory Board includes Dr. Robyn Benson, Founder of the Santa Fe Soul Center for Optimal Wellness. Her attributed endorsement on the lander supports the organic citrulline and nitrate formulation. That's a board member's attributed statement - not an independent clinical assessment, and not independently verified by this review.
5 Things to Verify Before You Subscribe to FLOW
Each item below is a genuine gap or conflict found during the research for this article. They're all resolvable - most with a single phone call or email to the brand. The reason to resolve them before you subscribe rather than after is simple: several of them are materially easier to act on when you haven't yet committed money. Once the subscription is active and the first auto-renewal has processed, your leverage as a buyer is purely whatever the policy says it is. Right now, you have the leverage to ask the questions and get written answers before anything is charged.
1. Which guarantee period applies to your subscription order?
The subscription lander says 364 days. The brand's ToS, refund page, and store header all say 90 days. Contact The20 at [email protected] or +1 (307) 240-6862 and ask specifically: "I'm ordering through the subscription lander. Does the 364-day or 90-day return window apply?" Get the answer in writing before subscribing if this matters to you.
2. What is the current return address?
Two addresses appear on brand-controlled pages: Englewood CO 80112 (ToS and refund page) and Aurora CO 80011 (ClickBank lander footer). Never ship a return without an RMA number AND a confirmed current return address from the brand. Contact [email protected] or call +1 (307) 240-6862 before returning anything.
3. What are the per-ingredient amounts within the 850mg blend?
The 850mg total blend per serving is confirmed. The individual amounts of watermelon-derived citrulline, spinach, acerola cherry, pine bark, and N-Acetyl-Cysteine within that blend are not disclosed on accessible brand pages. If knowing specific dosages matters to your decision - for example, if you're tracking total daily citrulline intake - contact the brand before ordering.
4. What is the NAC regulatory status?
N-Acetyl-Cysteine (NAC) appears in the FLOW formulation per the Amazon product listing. The FDA has taken a regulatory position that NAC cannot lawfully be marketed as a dietary supplement ingredient in certain contexts. If this concerns you, ask The20 directly how they address NAC's regulatory status in the FLOW formulation.
5. What is the shipping cost for the free first bottle?
The subscription lander says "just pay shipping" but doesn't state the shipping amount on the page itself. You'll see it at checkout. Confirm the all-in first-order cost before completing your subscription enrollment.
What Are the Most Common FLOW Complaints - and Are They Legitimate?
This section exists because "FLOW complaints," "FLOW subscription issues," and "FLOW guarantee problems" are among the most common searches for this product - and most existing content doesn't address them directly or honestly. Here's what the research for this article actually found.
The guarantee duration discrepancy
This is the most substantive consumer complaint you're likely to encounter in the wild, and it's legitimate. The subscription lander promises 364 days to return unused product. The brand's own Terms of Service and dedicated refund policy page both say 90 days. These are contradictory and they're both currently live on brand-controlled pages. Buyers who ordered expecting a near-year-long safety net may find they have 90 days when they look at the actual policy. The only resolution is to contact The20 directly before subscribing and get written confirmation of which window governs your order.
The return address confusion
Two different physical return addresses appear on brand-controlled pages: one in Englewood, Colorado and one in Aurora, Colorado. Buyers attempting to return without calling first risk shipping to the wrong address. The remedy is straightforward - call or email for an RMA number before you ship anything, and confirm the current return address at the same time. Returns without an RMA number on the exterior of the box won't be processed regardless of which address they arrive at.
The undisclosed per-ingredient dosages
The 850mg total blend per serving is confirmed. What isn't disclosed is how much of that 850mg is L-Citrulline versus spinach versus acerola cherry versus pine bark extract versus N-Acetyl-Cysteine. Buyers who want to compare the citrulline content against published clinical research benchmarks - where the evidence tends to point toward multi-gram dosing - can't do that math with what the brand publishes. This is a common supplement industry practice, not unique to FLOW, but it's a legitimate criticism if specific ingredient dosing matters to your decision. Contact the brand and ask before ordering.
The subscription auto-renewal mechanics
The subscription lander is designed to convert on a free-first-bottle offer, and the ongoing $22.47 monthly billing can catch buyers off-guard if they don't clock the renewal terms at checkout. The cancellation process - email or phone call, at least one business day before renewal - is functional but requires proactive action on the buyer's part. Set a calendar reminder if you're not planning to continue past the first bottle. The brand does allow pausing rather than canceling, which is a useful option if you want to take a break without losing the subscription rate.
The shipping cost transparency gap
"Just pay shipping" appears multiple times on the lander without ever stating the actual shipping amount. You won't see the figure until checkout. It's not a bait-and-switch - it's just incomplete information at the point where buyers are deciding whether to proceed. Factor this into your evaluation: click through to the checkout flow to see the real all-in cost before you commit to the subscription.
The N-Acetyl-Cysteine (NAC) status question
NAC appears in the product's Amazon listing as a confirmed ingredient. The FDA has taken a regulatory position that NAC faces marketing restrictions as a dietary supplement ingredient in certain contexts, based on prior FDA enforcement activity. The brand doesn't address this proactively in accessible marketing materials. If NAC's presence or regulatory status concerns you, that question deserves a direct answer from The20 before you subscribe.
None of these are disqualifying on their own - they're the things a thorough buyer checks before committing to a recurring subscription. The product itself has a legitimate ingredient stack, a real operating company behind it, and a sourcing story that holds up. The complaints that exist are about documentation gaps and policy inconsistencies, not about the formula being fake or unsafe.
FLOW Fast Facts
Product: FLOW Nitric Oxide Booster - The20, LLC
Form: Gelatin capsules (not vegan/vegetarian)
Serving size: 2 capsules
Total blend per serving: 850mg proprietary blend
Capsules per bottle: 60
Standard supply duration: 30 days
Primary active compound: Organic watermelon-derived L-Citrulline
Secondary active compounds: Organic spinach (dietary nitrates), Organic acerola cherry (Vitamin C), Pine bark extract (Pinus pinaster)
Other ingredients confirmed: N-Acetyl-Cysteine (per Amazon listing), Organic rice flour (excipient), Tapioca starch (trace)
Contains: Gelatin (not vegan)
Free of: Gluten, sugar, lactose, soy, L-Arginine, magnesium stearate, titanium dioxide
Non-GMO: Confirmed per brand
Made in USA: Confirmed per Amazon product listing and brand pages
Subscription pricing (via affiliate link lander): First bottle free (pay shipping); then $22.47/month
One-time purchase pricing (the20store.com): $29.95/bottle
Subscription alternative (the20store.com): $59.95 every 3 months (3-bottle, free US shipping)
Guarantee: 90 days per ToS and refund page; 364 days per subscription lander - CONFLICT, confirm with brand
Retailer of record (subscription lander): ClickBank / Click Sales, Inc.
Return address: Confirmed at two different addresses - obtain RMA and verify current address before returning
Customer support: [email protected] / +1 (307) 240-6862 / toll-free (800) 211-6190
ClickBank order support: [email protected] / US: +1 (800) 390-6035
Cancel subscription: Email [email protected] or call +1 (307) 240-6862 at least 1 business day before renewal
Parent company: Personal Life Media, Inc., Mill Valley CA
Operating entity: The20, LLC, Sheridan WY
See What The20 Says About FLOW and Review the Subscription Terms
Quick Answers: Your Most Common FLOW Questions, Answered Directly
What is FLOW Nitric Oxide Booster?
FLOW Nitric Oxide Booster is a dietary supplement from The20, LLC - co-founded by wellness educator Susan Bratton - formulated to support nitric oxide production and blood flow using organic food-derived ingredients, primarily L-Citrulline sourced from fermented organic watermelon. Each serving is two gelatin capsules delivering 850mg of a proprietary blend. FLOW is not FDA-approved and is not intended to diagnose, treat, cure, or prevent any disease, per the brand's own disclaimer. Sold via subscription (first bottle free, then $22.47 per month) through ClickBank, and also available one-time at $29.95 per bottle through The20Store.
Is FLOW safe to take with other medications?
FLOW is not recommended without medical clearance for anyone currently taking blood pressure medications, organic nitrates, phosphodiesterase inhibitors, or anticoagulants. L-Citrulline and pine bark extract both support nitric oxide and vasodilation pathways - combining them with prescription medications that affect the same vascular pathways may create potential medication interaction concerns. The brand explicitly recommends consulting a healthcare professional before use if any of those conditions apply, and the same caution applies to kidney or renal issues, pregnancy, lactation, or trying to conceive. Get clearance before you start, not after.
How long does one bottle of FLOW last?
One bottle of FLOW lasts 30 days at the standard two-capsule daily dose, which is 60 capsules total. The brand notes in its own FAQ that taking additional capsules beyond the daily maintenance dose - which some usage guidance suggests in specific contexts - means the bottle won't last the full 30 days. Plan for more than one bottle per month if you vary your daily dosing. Serving count and serving size confirmed from brand pages.
What is the return policy for FLOW?
FLOW's return policy is in documented conflict across brand pages. The subscription lander states 364 days from purchase for unused portions minus shipping; the brand's Terms of Service, refund policy page, and The20Store header all state 90 days. Before subscribing, ask The20 in writing which window governs ClickBank subscription orders. If returning: obtain an RMA number first - required, returns without it won't be processed - confirm the current return address (two different ones appear across brand pages), and ship with tracking. Return postage is the buyer's responsibility.
Does FLOW contain L-Arginine?
FLOW does not contain L-Arginine - the formula is L-Arginine-free by design. The brand chose L-Citrulline from organic watermelon instead because citrulline bypasses liver metabolism, travels to the kidneys where it's converted to L-Arginine, and creates a more direct route to the body's nitric oxide synthesis pathway. Published pharmacokinetic research has documented the bioavailability advantage of citrulline over direct L-Arginine supplementation, consistent with the brand's stated rationale. The absence of L-Arginine is a confirmed brand design choice, stated on product pages.
Frequently Asked Questions About FLOW
Who is FLOW made for?
According to The20, FLOW is formulated for adults across the gender spectrum who want cardiovascular circulation support. The brand specifically positions it for people over 40 - the point at which nitric oxide production begins declining - though it describes the formula as beneficial for any adult interested in supporting nitric oxide pathways. The brand's FAQ explicitly states the product is for "everyone across the gender spectrum: men, women, and non-binary humans." The supplement is not appropriate without medical clearance for anyone under 18, anyone pregnant or lactating, anyone trying to conceive, or anyone on medications affecting blood pressure, vascular function, or kidney function.
What makes FLOW different from other nitric oxide supplements?
The20 claims two distinguishing characteristics. First, the source of L-Citrulline: organic watermelon fermentation rather than the corn-derived synthetic manufacturing process used for most bulk amino acid supply. The brand states its sourcing approach is intended to address concerns some consumers have about ingredient origin and agricultural practices. Second, dual-pathway support: organic watermelon for the endothelial nitric oxide pathway and organic spinach for the salivary nitrate-to-nitrite-to-nitric oxide pathway. The brand says most beet-based supplements target only the salivary pathway. These are brand-stated claims; independent comparative testing of FLOW against other nitric oxide supplements has not been conducted by this publication.
Are there any third-party certifications for FLOW?
The brand states in product page copy that each batch is tested for gluten, molds, and bacteria and confirms ingredients are as formulated. However, no specific third-party certification - NSF, USP, Informed Sport, or similar - was identified on accessible brand pages during the research for this review. The brand describes working with a family-owned US manufacturer that "actively manages government certifications and independent laboratory testing." That language attributes quality practices to the manufacturer but doesn't specify which certifications have been achieved. If specific certification status is important to your purchasing decision, contact The20 directly at [email protected] and ask for documentation.
Is FLOW vegetarian or vegan?
No. FLOW uses gelatin capsules. The brand acknowledges this on its FAQ page and notes it chose gelatin because "the large majority of customers are not vegetarian" and that vegetarian capsules were more difficult to source. Gelatin is derived from animal collagen, making FLOW unsuitable for vegetarians and vegans. This is clearly stated by the brand. There's no vegan alternative version of FLOW available on accessible brand pages as of June 2026.
How do I cancel a FLOW subscription?
According to The20's Terms of Service, to cancel your subscription: email [email protected] or call +1 (307) 240-6862 at least one business day before your next renewal date. The billing cycle automatically renews at $22.47 per month unless you cancel before the renewal. There is no self-service cancellation portal referenced in accessible ToS language - cancellation is by email or phone. Keep a record of your cancellation communication in case of any billing dispute. The brand also offers the option to pause or reactivate your subscription rather than canceling outright, per the subscription details section on The20Store product page.
Who is Susan Bratton, and what is her connection to FLOW?
Susan Bratton is the co-founder of The20, LLC and the primary public voice behind the FLOW Nitric Oxide Booster brand. She's a wellness educator and author who has built a significant audience - the brand's own materials cite an estimated 40 million readers and listeners across her podcast, books, and educational programs focused on healthy aging and vitality. She is not a physician. Her role at The20 is as founder and wellness advocate, not as a formulator or medical authority. The brand positions her as someone who has spent years synthesizing research on how the body ages and what nutritional support can address that. Dr. Robyn Benson, identified on the lander as Founder of the Santa Fe Soul Center for Optimal Wellness and a member of The20's Medical Advisory Board, provides the brand's medical advisory perspective. Susan Bratton's educational background and public presence are part of why FLOW's marketing resonates with its target audience - adults over 40 who take their health seriously and want to understand what they're putting in their body, not just be told it works.
What is the brand behind FLOW?
FLOW is produced by The20, LLC, a health and wellness company based in Sheridan, Wyoming, operating under the parent company Personal Life Media, Inc., based in Mill Valley, California. The20, LLC was co-founded by Susan Bratton and Tim Bratton, and the brand states it has supported customers since 2006. Susan Bratton's public profile and educational content are central to the brand's positioning and marketing identity. For subscription orders through the ClickBank lander, the retailer of record is ClickBank (Click Sales, Inc., a Delaware corporation). The operating entity for product and customer service purposes is The20, LLC - contact at [email protected] or +1 (307) 240-6862.
Does FLOW contain any allergens?
According to The20's FAQ, FLOW is free of: soy, sugar, lactose, gluten, titanium dioxide, methacrylic copolymers, and methyl or propyl parabens. The formula contains gelatin capsules (animal-derived), organic rice flour (a starch; stated gluten-free), and a trace of tapioca starch from the watermelon fermentation process (also gluten-free). There is no wheat starch, starch hydrolysate, or MSG in the formula. If you have specific allergen concerns beyond those listed, contact The20 at [email protected] for full ingredient disclosure.
What does FLOW taste like or feel like to take?
FLOW is a capsule supplement - there's no flavor to speak of in the taking of it, as you swallow the capsules whole. The capsules are size 0, which the brand describes as the smallest size that accommodates the 850mg dose. There's no stated instruction to take with food, though the brand suggests taking two capsules daily - morning or evening, whichever is consistent for you - and notes the supplement can be taken up to an additional two capsules on any given day in specific usage contexts. For the precise usage protocol, refer to the label directions on your bottle and the brand's FAQ page.
Can I buy FLOW without a subscription?
Yes. The20Store (the20store.com) offers a one-time purchase option for $29.95 per bottle. The subscription lander linked in this article is the subscription-first offer (first bottle free, then $22.47/month). If you want to try FLOW without a recurring commitment, visit the20store.com directly and select the one-time purchase option. Note that the one-time price ($29.95) is higher than the subscription monthly rate ($22.47), so the subscription structure does offer per-bottle savings if you continue past the first month.
What is the L-Citrulline content in FLOW?
The total proprietary blend per serving is 850mg, confirmed from brand pages. The specific amount of L-Citrulline within that blend is not disclosed - the brand uses a proprietary blend designation that lists the total rather than breaking out individual ingredient amounts. Many consumers researching clinical citrulline dosing will note that published studies often use gram-level doses (3g-6g range). The 850mg total blend contains L-Citrulline as one of several ingredients, so the citrulline content is a fraction of that figure. If specific citrulline dosage matters to your decision, contact The20 directly to ask what the formulation contains on a per-ingredient basis.
Is FLOW FDA-approved?
No. FLOW is a dietary supplement, not a drug. Under U.S. law, dietary supplements are not FDA-approved before they go to market. They're regulated under the Dietary Supplement Health and Education Act (DSHEA), which holds manufacturers responsible for product safety but doesn't require pre-market approval. The brand cites self-affirmed GRAS status for L-Citrulline - it's worth understanding what that means: self-affirmed GRAS is a determination made by a manufacturer or qualified expert panel that an ingredient meets the general recognition of safety standard. It is not a status granted by the FDA, and it is distinct from FDA drug approval. The brand's disclaimer - "not intended to diagnose, treat, cure, or prevent any disease" - is both legally required and accurate. FLOW is a wellness supplement in the cardiovascular support category.
What is The20's parent company?
The20, LLC is the operating entity behind FLOW and the The20Store. Its parent company is Personal Life Media, Inc., located at 35 Miller Ave, Suite 153, Mill Valley, CA 94941. This relationship is disclosed on The20Store's privacy policy page. The legal entity The20, LLC is registered in Wyoming (mailing address: 30 North Gould Street, Suite #2988, Sheridan, WY 82801). For all product inquiries, the correct contact is The20, LLC at [email protected] or +1 (307) 240-6862.
What is the GRAS status of L-Citrulline?
The brand cites self-affirmed GRAS status for L-Citrulline, per its reference to the FDA's GRAS program. It's worth understanding what that means: self-affirmed GRAS is a determination made by manufacturers or qualified expert panels that an ingredient meets the general recognition of safety standard - it is not a status granted or approved by the FDA, and is distinct from FDA drug approval or pre-market review. Published clinical trials have used L-Citrulline safely in both adults and children, which is the actual safety evidence behind the brand's citation. The brand cites ncbi.nlm.nih.gov/pubmed/17901164 and the FDA's GRAS program page as supporting sources. Readers can verify this directly at fda.gov.
Is there a FLOW shipping cost?
For the subscription lander (the page linked in this article): you pay shipping on the first free bottle; the amount is disclosed at checkout. For The20Store orders of $50 or more: free US shipping. For orders under $50 at the store: shipping costs apply and are calculated at checkout. For international orders: import duties, taxes, and charges are the buyer's responsibility - these are not included in the product price or any shipping fee charged by The20. The subscription lander footer explicitly notes this for international customers. Confirm all shipping costs at checkout before completing your order.
How does the FLOW subscription billing work?
When you order through the subscription lander, you're enrolling in a recurring billing program through ClickBank. First bottle: free, you pay shipping only. Month two and beyond: $22.47 automatically charged to your payment card and a new bottle ships out. To cancel: email [email protected] or call +1 (307) 240-6862 at least one business day before your next renewal date. Do it before the cutoff and nothing charges. Miss the cutoff and you're in for another cycle. The brand also says you can pause or reactivate rather than cancel outright - that's worth knowing if you just want to take a break rather than end the subscription. Keep a record of whatever cancellation communication you send - just good practice with any recurring billing program.
FLOW Buyer Verification Checklist
Confirmed the subscription pricing: First bottle free (pay shipping), then $22.47/month recurring
Confirmed the cancellation process: Email [email protected] or call +1 (307) 240-6862 at least 1 business day before renewal
Asked the brand which guarantee period - 364 days (lander) or 90 days (ToS/refund page) - applies to subscription orders
Obtained current return address and RMA process from brand before any planned return
Consulted a healthcare provider if taking blood pressure medications, cardiovascular prescriptions, anticoagulants, or have kidney issues
Confirmed shipping cost at checkout before completing subscription enrollment
Noted ClickBank as retailer of record for subscription billing support
Bookmarked cancellation contact: [email protected] / +1 (307) 240-6862
The Bottom Line on FLOW Nitric Oxide Booster
The short answer: FLOW Nitric Oxide Booster is a legitimately formulated organic blood flow supplement with a clean, research-backed ingredient stack - and three buyer-protection questions worth resolving before you commit to the subscription.
Here's an honest take. FLOW has a real differentiator that's confirmed - organic food-derived sourcing for L-Citrulline when the category default is synthetic bulk powder, plus dual-pathway support (endothelial and salivary) that most single-ingredient nitric oxide supplements don't offer. Susan Bratton and Tim Bratton have built a brand with a documented operating history going back to 2006, real contact infrastructure, and a formulation logic grounded in published ingredient-level research. The FDA disclaimer is accurate. The sourcing story holds up to scrutiny.
The gaps are real too, and they're all documented above. The guarantee conflict is the most important - confirm before you subscribe whether the 364-day window on the lander or the 90-day window in the ToS governs your order. The undisclosed per-ingredient dosages make it impossible to independently benchmark the citrulline content against clinical research standards. The NAC regulatory question is worth a quick email to the brand before you start. And the two different return addresses across brand pages means you need to call first if you ever need to use the guarantee.
None of that disqualifies FLOW for the right buyer. If you're over 40, interested in cardiovascular circulation support, and want organic food-sourced ingredients over synthetic compounds - and you're not on blood pressure or cardiovascular medications that interact with nitric oxide pathways - this is worth evaluating. The subscription model makes the first bottle a genuinely low-cost trial. Work through the five verification items above before you check out. Five minutes of clarification now is cheaper than a billing dispute later.
One last thing worth saying plainly: the underlying reason to look at nitric oxide support doesn't hold still while you're deciding. The documented decline in nitric oxide production is a biological reality, not a marketing hook - and whatever you ultimately choose, the decision is worth making with full information rather than half of it. This article gives you the full picture. What you do with it is yours.
FLOW is a dietary supplement, not a drug, and is not FDA-approved to diagnose, treat, cure, or prevent any disease. Individual results vary. Pricing, terms, and policies are subject to change - confirm current information at the20.store before ordering.
Start Your FLOW Free-Bottle Offer and Confirm Current Subscription Terms
Contact Information
Company: The20
Email: [email protected]
Phone Support: +1 (307) 240-6862 before returning anything.
Address: Englewood CO 80112 and Aurora CO 80011. Never ship a return without an RMA number AND a confirmed current return address from the brand. Contact through email or phone before returning anything.
Disclaimers
Material Limitations: This article is a paid advertorial produced for consumer education purposes. The publisher earns an affiliate commission on purchases made through links in this article. All product information is sourced from The20, LLC's publicly accessible brand pages, the subscription lander at the20.store, The20Store product and policy pages, and verified third-party product listings including the Amazon ASIN B085DHHRS1. No physical product testing was conducted by this publication. Brand claims are not independently verified - they are attributed to The20, LLC and should be evaluated as such. Title phrases including "organic blood flow supplement" are brand-originated marketing language, not editorial endorsements or independently verified rankings. Facts that could not be confirmed from live sources - including per-ingredient dosages within the proprietary blend, specific third-party certifications, and shipping processing window - were omitted rather than assumed. Readers should verify all material claims at the official brand site before purchasing. Prices, policies, and product details may change after publication - confirm current information at the20.store.
Third-Party Feedback Platforms: Testimonials and reviews referenced in this article are brand-sourced or appear on third-party platforms and are not independently verified by this publication. Individual experiences vary. Endorsements from named advisors are attributed as stated and are not independently confirmed clinical assessments. Readers should evaluate third-party review content critically and not rely on any single source, including this article, as the basis for a purchasing decision.
Forward-Looking Statements: This article reflects brand materials, pricing, and policies as of June 2026. Subscription pricing, guarantee terms, return policies, ingredient formulations, and contact information are subject to change without notice. All information in this article should be verified at the20.store and the20store.com before ordering. The publisher makes no representation that any information contained herein will remain current after the date of publication.
Reasonable Consumer Standard: Attribution language throughout this article - including phrases such as "according to the brand," "the brand states," and "per The20" - identifies claims made by The20, LLC in its own marketing materials. These attributions are intended to help readers distinguish brand assertions from independently established facts. The title phrase "organic blood flow supplement" is brand-asserted marketing language describing how The20 characterizes its formulation - it is not an independent editorial ranking, a laboratory-verified claim, or a regulatory certification. Promotional phrases in this article's title and subheadings reflect language used by The20 in its own marketing and do not constitute endorsement by this publication.
Subscription and Auto-Renewal Disclosure: The FLOW offer accessible through this article's affiliate links is a subscription product. Your first bottle is provided at no cost beyond shipping. After the first shipment, your payment method is automatically charged $22.47 per month, and new bottles ship automatically. To cancel: email [email protected] or call +1 (307) 240-6862 at least one business day before your next renewal date. California residents: this subscription is governed by California Business and Professions Code §17600. The terms of this subscription are governed by ROSCA (Restore Online Shoppers' Confidence Act). ClickBank (Click Sales, Inc.) is the retailer of record and processes billing.
Drug Interaction and Medical Disclosure: L-Citrulline, dietary nitrates, and pine bark extract in FLOW all support nitric oxide and vasodilation pathways. Individuals taking prescription blood pressure medications, organic nitrates, phosphodiesterase inhibitors, anticoagulants, or blood thinners should consult a healthcare provider before using FLOW or any nitric oxide supplement. FLOW is not a substitute for medical care. These statements have not been evaluated by the Food and Drug Administration. FLOW is not intended to diagnose, treat, cure, or prevent any disease.
California Proposition 65 Notice: WARNING: This product may expose you to chemicals including those known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to P65Warnings.ca.gov. This disclosure is required for products sold to California consumers under California Health and Safety Code §25249.6. The presence of this notice does not constitute a finding by this publication that the product contains any listed substance at any specific level - it is a standard precautionary disclosure required for dietary supplements sold in California.
Trademark Acknowledgment: FLOW Nitric Oxide Booster® is a registered trademark of The20, LLC, based on the ® designation used on the brand's own official marketing pages. CLICKBANK® is a registered trademark of Click Sales, Inc. All other product and brand names referenced in this article are the property of their respective owners. Use of these names in this article is nominative and does not imply any affiliation, sponsorship, or endorsement not explicitly stated.
Geographic and Jurisdictional Notice: This article is intended for US audiences. International buyers should note that import duties, taxes, and customs charges are not included in product pricing and are the buyer's responsibility. The20's return policy has separate terms for international orders - see the20store.com/refund/ for international return policy details. Auto-renewal laws, consumer protection requirements, and applicable guarantee terms may vary by jurisdiction. EU buyers: consult current brand pages for any reference price or promotional compliance specific to your jurisdiction.
Affiliate Compensation Disclosure: This publication receives affiliate compensation from The20, LLC or its affiliate program administrators when readers purchase FLOW through links in this article. This compensation relationship is disclosed per FTC 16 CFR Part 255 requirements for material connections. The existence of this compensation relationship does not affect the editorial findings, documented gaps, or verification flags reported in this article.
ClickBank Retailer Notice: ClickBank is the retailer of products on the subscription lander at the20.store. CLICKBANK® is a registered trademark of Click Sales, Inc., a Delaware corporation located at 1444 S. Entertainment Ave., Suite 410, Boise, ID 83709, USA, and used by permission. ClickBank's role as retailer does not constitute an endorsement, approval, or review of FLOW or any claim, statement, or opinion used in promotion of this product.
SOURCE: The20