Thursday, 16 July 2026 11:45 AM
Advertorial
As GLP-3R research interest accelerates in 2026, this three-supplier comparison examines why Sourced Peptides' brand-stated 99.745% purity result, same-price 30mg vial, and current BOGO offer are drawing qualified buyer attention-alongside the COA documentation, pricing differences, supplier transparency, and purchase terms researchers are evaluating before ordering.
WASHINGTON, D.C. / ACCESS Newswire / July 16, 2026 / Quick disclosure before you read further: this is a paid advertorial and contains affiliate links. A commission is earned if you purchase through links in this article. Product claims are attributed to each brand and are not independently endorsed. GLP-3R and the other products discussed below are sold as research compounds for qualified research use only - not dietary supplements, not drugs, not FDA-approved, and not intended for human or animal consumption. This content is promotional in nature and is intended for reader education regarding commercially available research materials. Official site discussed in most depth: sourcedpeptides.com/product/glp-3r. Details reflect brand materials reviewed on July 16, 2026 - confirm current information directly with each brand before making any decisions.
Regulatory Disclosure: The products discussed are presented by their respective sellers as research-use-only laboratory materials. They are not FDA-approved drugs, dietary supplements, foods, cosmetics, diagnostic products, or veterinary products and are not intended for human or animal consumption, therapeutic use, diagnostic use, or clinical application. This article does not provide medical, dosing, preparation, handling, or experimental advice.
GLP-3R Reviews 2026: Sourced Peptides vs. Nationwide vs. Pure Health Peptides - Purity, Pricing, Ingredients (Consumer Research)
Quick Answer: GLP-3R is a research-use-only lyophilized peptide sold by multiple suppliers, including Sourced Peptides, Nationwide Peptides, and Pure Health Peptides. Sourced Peptides prices all three vial sizes (5mg, 10mg, 30mg) at a flat $109.69 with a lot-specific 99.745% purity COA; Nationwide Peptides and Pure Health Peptides price by size and both explicitly disclose the compound's correspondence to LY3437943 (retatrutide), a detail Sourced Peptides' listing does not include.
You've probably landed here after seeing GLP-3R mentioned in a peptide forum thread, a research-chemical subreddit, or a supplier's ad, and now you're doing what any careful buyer or institutional purchaser should do before committing budget to a vial: comparing who's actually selling it, what's documented about purity and identity, and what the fine print says about returns, shipping, and liability. Three suppliers turned up consistently in that research - Sourced Peptides, Nationwide Peptides, and Pure Health Peptides - and this article lines up what each one discloses, side by side, so you can make your own informed call.
What this comparison found that a single product page won't tell you:
Two of the three suppliers explicitly identify GLP-3R as corresponding to LY3437943 (retatrutide) in their own compliance language - Sourced Peptides' listing doesn't use either term anywhere reviewed
Sourced Peptides' product page displays a "30-day refund policy" badge that its own Terms & Conditions directly contradict
Sourced Peptides' site states two different minimum purchase ages (21 at the gate, 18 in the Terms) that don't match each other
Sourced Peptides' product page displays two different review-count totals (10,247 and 3,841) in two different sections of the same page
Pure Health Peptides names two different testing labs across its own site (Ethos Analytics and Bioviridian), and this article couldn't confirm which one, if either, tested the specific GLP-3(R) lot
Only Nationwide Peptides and Pure Health Peptides publish a registered legal entity name; Sourced Peptides' reviewed pages don't
See Sourced Peptides' current GLP-3R lot COA, pricing, and BOGO status
For a closer single-brand look at Sourced Peptides' GLP-3R listing specifically - including its pricing tiers, guarantee language, and site-level discrepancies in more depth than this comparison covers - see this article's prior coverage of Sourced Peptides' GLP-3R purity listing and BOGO offer.
What Is GLP-3R, and Why Are Three Different Suppliers Selling It Right Now?
GLP-3R is the name used across the research-peptide market for a synthetic, lyophilized peptide described as a triple-receptor compound active across GLP-1, GIP, and glucagon-related signaling pathways. All three suppliers reviewed here - Sourced Peptides, Nationwide Peptides, and Pure Health Peptides - sell it strictly as a research-use-only laboratory material, not as a supplement, drug, or consumer health product. None of the three markets it for human or animal consumption, and all three require buyers to represent themselves as qualified researchers or research-adjacent purchasers.
The timing overlaps with increased public attention surrounding Eli Lilly's investigational retatrutide program. Retatrutide (LY3437943) - a first-in-class investigational triple hormone receptor agonist targeting the same GIP, GLP-1, and glucagon receptor family - posted positive Phase 3 topline results from its TRIUMPH-1 obesity trial in May 2026, with a nested sleep-apnea substudy reported at the ADA Scientific Sessions in June 2026 and additional Phase 3 programs (TRIUMPH-3, TRIUMPH-7, TRIUMPH-8) active or recruiting through mid-2026. Retatrutide remains investigational and is not FDA-approved for any indication as of this article's research date. Any future regulatory filing, approval decision, launch timing, or commercial availability remains uncertain unless and until formally announced by Eli Lilly or the FDA. This article did not establish whether that news cycle affected interest, traffic, sales, or supplier activity for any GLP-3R listing.
Buyer takeaway: the timing overlaps with real retatrutide clinical trial news, but that overlap doesn't establish why any individual supplier's GLP-3R vial is drawing attention. It has no bearing on whether that vial is accurately characterized, correctly dosed, or free of contamination - that's a separate question, and it's the one this article actually investigates.
The Naming Gap: Which Suppliers Actually Disclose the LY3437943/Retatrutide Connection?
Here's the first meaningful difference between the three listings reviewed for this article, and it's not a pricing or purity number: it's a disclosure gap. Pure Health Peptides states directly, in its own compliance notice, that its GLP-3(R) product's "structural characteristics correspond to the peptide (LY3437943), a synthetic multi-receptor agonist (GLP-1/GIP/glucagon receptor) currently under clinical investigation," while also stating plainly that "this research material is not the investigational drug product." Nationwide Peptides tags its GLP-3R listing with both "LY3437943" and "retatrutide" directly in its own product metadata and research-reference section, again framed as research-referenced literature context rather than a claim about its own vial's clinical activity.
Sourced Peptides' GLP-3R listing, by contrast, doesn't use either term anywhere in the product description, specifications, or FAQ content reviewed for this article. Its own copy describes the compound only by its molecular formula, weight, and receptor-pathway activity - GLP-1, GIP, and glucagon-related pathways - without naming the compound it's commonly associated with in the wider research-chemical market. That's not necessarily a red flag on its own; a supplier isn't obligated to use a market nickname. But if the compound's relationship to the broader retatrutide research literature matters to your evaluation - for citation purposes, for internal documentation, or simply so you know what you're buying relative to what's discussed in the metabolic-research literature - Sourced Peptides' page won't tell you that, and you'd need to ask directly.
Buyer takeaway: if traceability to the specific investigational compound in the research literature matters for your use case, Nationwide Peptides' and Pure Health Peptides' listings currently disclose that connection explicitly; Sourced Peptides' listing, reviewed as of July 16, 2026, does not.
What Sourced Peptides Actually Discloses About GLP-3R
View the current GLP-3R listing and lot-specific COA at Sourced Peptides (affiliate link; redirects through a third-party intermediary domain to the brand's listing)
Sourced Peptides' reviewed listing includes:
Compound: 39-residue synthetic peptide, molecular formula C₂₂₁H₃₄₂N₄₆O₆₈, molecular weight approximately 4731.1 g/mol, supplied as a white lyophilized powder
Purity/COA: lot-specific Certificate of Analysis attributed to LabFreedom Diagnostics, showing 99.745% purity by HPLC-UV with mass spectrometry confirming an observed ion of [M+3H]³⁺ at 1578.05 m/z, accession number 2603100041, lot 030622026REE34
COA report date: displayed as "11/03/2026" (date-format convention not independently clarified)
Sizes and pricing: 5mg, 10mg, and 30mg, each priced identically at $109.69, with a bundle option listed at $318.83
Current promotion: Buy 1, Get 1 Free applying to a single starter vial at any of the three dosages, as of this article's research date
A 10mL bacteriostatic-water add-on is available for $9.97. Shipping is domestic U.S. only, with a stated 2-5 business day delivery window via USPS or Amazon Logistics, and free shipping site-wide per the product page's trust badges. Contact is limited to a single email address ([email protected]); no phone number or physical street address appears on the pages reviewed for this article, and no full registered legal entity name beyond "Sourced Peptides" was located.
Buyer takeaway: you get a detailed, lot-matched purity document from Sourced Peptides, but you won't find a phone number, a street address, or a full legal entity name anywhere on the pages this article reviewed - if you need that for institutional paperwork, you'll have to email and ask before you order.
What Nationwide Peptides Discloses About Its GLP-3R Listing
Nationwide Peptides' reviewed listing includes:
Operating entity: National Science Labs, LLC
Sizes and pricing: 5mg, 10mg, 15mg, 20mg, 30mg, 40mg, 50mg, and 60mg, priced from $43.00 to $306.00 depending on size (note: other pages on the same site displayed different price ranges for the same product on the dates reviewed, so confirm current pricing on the specific product page before ordering)
Purity: ≥98% by HPLC/MS (acetate salt form)
Testing lab: the brand's dedicated COA page states that "third-party COAs are provided by the top US-based third-party testing" partner, named there as Freedom Diagnostics - this article did not independently authenticate that lab, confirm its accreditation, or verify chain of custody
Facility claim: described as "GMP-aligned, ISO-compliant" - a brand-stated claim, not independently confirmed here
Shipping: free on orders over $200
Notably, Nationwide Peptides' listing is explicit about the compound's research context in a way Sourced Peptides' is not: it references Phase 2 clinical trial data on body weight as a primary endpoint and cites PubMed and PMC as general sources, framed as "research-referenced attributes... not therapeutic claims." The brand also publishes its operating entity name and a support phone number - (844) 480-0111 - directly on the product page. Its separately reviewed Terms & Conditions page states a minimum age of 21 and additionally requires that purchasers be affiliated with "a recognized laboratory, research institution, or facility" - consistent with the 21-plus figure on its product-page age gate, and a more specific eligibility requirement than either of the other two brands discloses. That page also states that all sales are final, with no returns accepted given the research-only nature of the products.
Buyer takeaway: if you want a named legal entity and a phone number you can actually call, Nationwide Peptides currently gives you both on the product page itself - something you'd have to ask Sourced Peptides for directly.
What Pure Health Peptides Discloses About Its GLP-3(R) Listing
Pure Health Peptides' reviewed listing includes:
Operating entity: Pure Health Peptides LLC
Sizes and pricing: 5mg, 10mg, 15mg, 20mg, and 30mg, starting at $57.00
Purity: ≥99% by HPLC
Testing labs: the brand's own site names more than one testing partner across different pages - a dedicated "COA Process" page states its testing partner is Ethos Analytics, ISO/IEC 17025-accredited with a specific accreditation number published, while at least one Certificate of Analysis image hosted on the same domain (for a different product) is branded to a separate lab, Bioviridian. This article did not independently confirm which lab, if any, tested the specific GLP-3(R) lot, or reconcile why the brand's own materials reference more than one testing partner
Shipping: free on orders over $175
Buyer gate: KYC (know-your-customer) verification required before order fulfillment, with the right to refuse orders that don't meet buyer-qualification criteria
Regulatory-role note: its FDA disclaimer states Pure Health Peptides LLC is not a compounding pharmacy or outsourcing facility under FD&C Act sections 503A/503B - a clarification not found on the other two brands' pages reviewed
Pure Health Peptides states directly in its compliance notice that the product's structural characteristics "correspond to the peptide (LY3437943)... currently under clinical investigation and not approved by the FDA for any indication," while clarifying that "this research material is not the investigational drug product."
Buyer takeaway: Pure Health Peptides requires KYC verification before fulfillment, based on its own product-page language; Nationwide Peptides and Sourced Peptides describe a purchase-time attestation and age-gate model instead, without an equivalent identity-verification step in the materials reviewed.
Pricing Side-by-Side: Three Similarly Named Research-Peptide Listings
Here's the split that matters: pricing structure is where the three suppliers diverge. Sourced Peptides uses flat per-vial pricing regardless of size - $109.69 whether you're buying a 5mg or 30mg vial - which means the 5mg vial costs the same as the 30mg vial. Nationwide Peptides and Pure Health Peptides both price by size instead, which generally puts their smallest listed sizes at a lower entry price than Sourced Peptides' flat rate, though exact cost-per-milligram depends on the specific size you compare.
Quick Answer: for buyers who only need a small quantity, Nationwide Peptides' $43.00 5mg listing and Pure Health Peptides' $57.00 entry price are both lower than Sourced Peptides' $109.69 flat rate. Sourced Peptides lists its 30mg vial at the same $109.69 price shown for its 5mg and 10mg options, while the competing listings use size-dependent pricing that rises with vial size. Confirm current pricing on each live site, since all three note pricing is subject to change without notice.
Compare Sourced Peptides' current per-vial pricing and BOGO offer
GLP-3R Ingredients and Purity Documentation Compared: What Each COA Actually Shows
All three suppliers publish a Certificate of Analysis, but the level of detail differs. Sourced Peptides names its testing lab (LabFreedom Diagnostics) and publishes a specific accession number, a specific lot number, HPLC-UV and mass-spec methodology, and a precise purity figure (99.745%) rather than a rounded threshold. Nationwide Peptides states purity as a threshold (≥98%) rather than a lot-specific figure in the page copy reviewed, and its dedicated COA page names Freedom Diagnostics as its testing partner. Pure Health Peptides states ≥99% purity and names Ethos Analytics as its testing partner on one page. A separate COA hosted on the same domain for another product identifies Bioviridian; that separate document does not establish which laboratory tested the current GLP-3(R) lot.
None of the labs named or described across the three brands - LabFreedom Diagnostics, Freedom Diagnostics, Ethos Analytics, or Bioviridian - was independently authenticated for this article. This article did not verify any lab's accreditation status, chain of custody, or testing methodology beyond what's displayed on each brand's own page. That verification step, if it matters to your research use, sits with you or your institution to confirm directly with each supplier.
Buyer takeaway: the reviewed Sourced Peptides document displays an accession number and lot number you can ask the brand to match against the exact vial you receive. The reviewed Nationwide Peptides page copy states a purity threshold instead of a lot-specific figure - request documentation identifying the specific lot that would ship with your order from any supplier before you buy.
Manufacturing and Facility Claims: What's Attributed, What's Confirmed
Sourced Peptides' page states its product is made in a "USA Made cGMP Facility" and lists "cGMP-Compliant Manufacturing" among its stated standards. Nationwide Peptides describes its facilities as "GMP-aligned, ISO-compliant." Neither brand's cGMP or GMP-alignment claim was confirmed against an FDA facility registration record or an independent GMP certification body's registry for this article - both are brand-stated claims, presented here as such. Pure Health Peptides doesn't make an explicit GMP claim in the materials reviewed but does state its lab uses ISO/IEC 17025 accreditation, a laboratory-testing standard rather than a manufacturing-facility standard, which is a meaningfully different claim than "GMP facility."
It's worth being precise about what these terms mean: cGMP (current Good Manufacturing Practice) governs manufacturing processes and facility conditions, while ISO/IEC 17025 accreditation governs a testing laboratory's competence to produce accurate results. A supplier can have one without the other, and neither claim was independently verified for any of the three brands discussed here.
Quick Answer: "cGMP facility" and "ISO/IEC 17025-accredited lab" are two different claims about two different things - one about where a compound is made, the other about how it's tested. Sourced Peptides and Nationwide Peptides make manufacturing-facility claims; Pure Health Peptides makes a lab-accreditation claim instead. None of the three was independently confirmed for this article, so treat all of them as brand-stated until you verify otherwise.
Buyer takeaway: if a specific compliance standard matters for your institution's procurement rules, ask each brand for the actual certificate or registration number behind its claim - a facility name and a certification body's registry entry, not just the phrase on the product page.
Refund and Return Policy Comparison - Including a Real Conflict on Sourced Peptides' Own Site
This is one of the more consequential differences among the three, and it's worth reading closely: Sourced Peptides' product page displays a "30-day refund policy" trust badge, but its own Terms & Conditions page states something narrower: returns aren't accepted once an order has shipped unless the item arrives damaged or defective, with refunds limited to damaged, defective, or wrong-item cases. The 30-day window referenced in the badge doesn't appear anywhere in the Terms & Conditions text itself. This isn't this article's interpretation - it's a direct comparison of two pages the brand itself publishes, and the two don't agree.
Nationwide Peptides and Pure Health Peptides weren't reviewed for their return-policy specifics in the same depth for this comparison, since it's Sourced Peptides' listing carrying the affiliate relationship for this article - but if a guarantee window is a deciding factor for you, confirm the specific terms directly with whichever supplier you're considering, in writing, before ordering. Don't rely on a badge or trust icon alone on any research-peptide supplier's site.
Buyer takeaway: the available Sourced Peptides materials contain conflicting return-language descriptions - a 30-day badge and a narrower Terms & Conditions provision - and this article can't determine which one legally governs a given transaction. Request the applicable return conditions in writing from Sourced Peptides before relying on either statement.
Check Sourced Peptides' current return terms before you order
Age-Verification and Eligibility Requirements Compared
Minimum age and eligibility requirements per brand:
Sourced Peptides: age-verification pop-up states 21-plus, but its Terms & Conditions page separately states a minimum age of 18, or 18 with parental consent - the two pages don't match each other
Nationwide Peptides: product-page age gate and its separately reviewed Terms & Conditions page both state 21, with the Terms adding an institutional-affiliation requirement ("a recognized laboratory, research institution, or facility")
Pure Health Peptides: states 21-plus directly on its product page alongside a KYC (know-your-customer) verification requirement before order fulfillment, described as applying to "qualified research professionals and institutional users" - a more formal gate than a self-reported age and purpose attestation
Buyer takeaway: you'll want to double-check Sourced Peptides' age requirement against your own records before you buy, since the two numbers on its own site (21 at the gate, 18 in the Terms) genuinely disagree - that's not the case with the other two suppliers reviewed here.
GLP-3R Reviews and Complaints: What Each Brand Displays, and What's Actually Verifiable
Sourced Peptides displays a 4.9-out-of-5 aggregate rating on its GLP-3R product page, with brand-hosted written reviews describing fast shipping, intact packaging, and COA documentation that reviewers say matched what they received. There's a discrepancy worth flagging on this same page, though: one part of the page displays "10,247 reviews" near the top, while the detailed rating breakdown further down the same page states the aggregate is "based on 3,841 reviews." Both figures are brand-displayed on the same product page, and neither is independently audited here. Nationwide Peptides' and Pure Health Peptides' GLP-3R-specific listings didn't display an aggregate review count or star rating in the materials reviewed for this comparison.
None of the reviews on any of these three sites are independently verified by this article. All are brand-published and brand-selected, displayed on brand-controlled pages, and the accuracy of third-party review platforms generally isn't endorsed here either way.
Buyer takeaway: a star rating and a review count on a brand's own page reflect what the brand chose to display, not what an independent platform verified. On Sourced Peptides specifically, the page displays two different review totals in two different sections.
Research Applications: What's Actually Established, Across All Three Listings
All three brands tie their GLP-3R/GLP-3(R) listings to the same general research area: receptor-binding and signaling investigation across GLP-1, GIP, and glucagon-related pathways, framed as relevant to metabolic and obesity-adjacent research models. That's a description of an active, real research field - reflected in Eli Lilly's ongoing retatrutide clinical program discussed above - not a citation to any product-specific published study. A structured PubMed search conducted while researching this article did not surface confirmed, product-specific studies referencing "GLP-3R" by name for any of the three suppliers' specific commercial material. Nationwide Peptides' page references PubMed and PMC sources in its own research-context section; this article did not independently confirm that those specific citations map to a study of any supplier's actual commercial product rather than the general receptor class.
Buyer takeaway: a supplier's reference to real published research on a receptor family (GLP-1/GIP/glucagon signaling generally) is not the same claim as research validating that specific supplier's vial. Keep those two categories of information separate when you're building your own citation trail.
Storage and Handling: What Each Brand States, in General Terms
The three suppliers publish differing brand-stated storage information for their respective materials, covering pre- and post-reconstitution conditions. This article does not reproduce or endorse preparation, reconstitution, experimental, or post-reconstitution instructions for any brand's product. Qualified laboratory personnel should use the lot-specific documentation and institutionally approved protocols applicable to the exact material received, rather than relying on any supplier's general product-page language.
Buyer takeaway: brand-published storage notes are not a substitute for your own lab's protocol - confirm handling requirements with your institution's safety officer or qualified personnel regardless of what any supplier's page states.
Shipping Comparison: Coverage, Speed, and Cost Thresholds
Shipping terms per brand:
Sourced Peptides: domestic U.S. only, stated 2-5 business day delivery window, confirmed via its dedicated shipping-information page
Nationwide Peptides: free shipping on orders over $200; states fast, protective packaging without a specific delivery-window figure in the materials reviewed
Pure Health Peptides: free shipping on orders over $175
This article confirmed Sourced Peptides' domestic-only policy directly; it did not locate or review a dedicated international-shipping policy page for Nationwide Peptides or Pure Health Peptides, so their coverage outside the U.S. wasn't independently confirmed either way.
Buyer takeaway: if you're ordering close to a research deadline, or need to confirm international eligibility, ask your chosen supplier for a specific delivery-window and coverage commitment in writing rather than relying on general "2-5 business days" or "fast shipping" language on any of these three sites.
See Sourced Peptides' current shipping terms and delivery window
Legal Entity Transparency: Documented Differences Among the Three
Legal entity disclosure per brand:
Nationwide Peptides: publishes its operating entity clearly - National Science Labs, LLC - in its site footer, copyright notice, and Terms & Conditions
Pure Health Peptides: publishes its operating entity, Pure Health Peptides LLC, in its disclaimers and FDA-disclaimer language, and additionally clarifies its regulatory role isn't a compounding pharmacy or outsourcing facility under specific FD&C Act sections
Sourced Peptides: its reviewed pages - product page, Terms & Conditions, footer - reference only the brand name "Sourced Peptides" without a distinct registered legal entity name, street address, or phone number appearing anywhere in the materials available
Buyer takeaway: if knowing the exact legal entity behind a purchase matters for your institution's purchasing, compliance, or accounts-payable records, Nationwide Peptides and Pure Health Peptides currently publish that information directly on-site; with Sourced Peptides, you'd need to request it directly before ordering.
Is GLP-3R Legit or Just Hype? What Sourced Peptides' Documentation Does and Doesn't Establish
The reviewed materials establish that a commercial website and product listing were accessible for Sourced Peptides, that the page displayed a document described as a lot-specific Certificate of Analysis with an accession number and lot number, and that a contact email was published. These observations do not verify the supplier's legal status, laboratory credentials, product identity, quality, suitability, or fulfillment performance. This article didn't authenticate LabFreedom Diagnostics as a testing laboratory, verify its accreditation, confirm chain of custody, or independently repeat any test. No published, product-specific research for GLP-3R under that exact name was located for any of the three suppliers compared in this article. None of this is a conclusion about suitability for your specific research purpose - it's the line between what's documented and what you'd still need to confirm directly.
Documented Differences Across the Three Reviewed Listings
The reviewed pages emphasize different features. Sourced Peptides displays a precise lot-specific purity result and flat listed pricing across all three vial sizes. Nationwide Peptides displays a wider size range, a named operating entity, and a published phone number. Pure Health Peptides states that KYC verification is required before fulfillment and explicitly references LY3437943 in its product designation notice. These observations are limited to the pages reviewed and are not supplier rankings or purchasing recommendations.
Review the current GLP-3R Certificate of Analysis at Sourced Peptides
Quick Answer: the three listings differ on documentation granularity, pricing structure, buyer-verification requirements, and entity disclosure. Sourced Peptides publishes a lot-specific purity figure and accession number. Nationwide Peptides publishes a wider size range and a named entity with phone support. Pure Health Peptides discloses the LY3437943 correspondence explicitly and requires KYC verification. None of these observations constitutes a recommendation to purchase from any specific brand.
Buyer takeaway: don't let one strong data point - like Sourced Peptides' precise purity figure - substitute for checking the other items in this article that matter to your specific purchase, like the refund-policy conflict or the missing legal entity name.
Things to Verify Before You Order From Any of These Three Suppliers
A handful of specific items are worth confirming directly with whichever supplier you're considering, rather than assuming any single page - including this one - tells the whole story. Get these in writing if they matter to your decision:
Verify #1 - Sourced Peptides' actual refund window and conditions. The product-page badge says 30 days; the Terms & Conditions describe a narrower damaged/defective/wrong-item-only policy with no stated window. Confirm which governs before you order.
Verify #2 - Sourced Peptides' governing minimum age. The site's age gate says 21+; the Terms & Conditions say 18 (or 18 with parental consent). Confirm which applies to your purchase.
Verify #3 - Whether any of the three brands' current promotions are still active. Confirm whether Sourced Peptides' BOGO offer, or any size-based discount on Nationwide Peptides or Pure Health Peptides, remains available on the applicable live product page.
Verify #4 - The full registered legal entity behind Sourced Peptides. Not disclosed on the pages reviewed for this article; confirm directly if it matters for institutional purchasing or compliance records.
Verify #5 - Whether the lot number on any COA you're shown matches what actually ships with your order, across all three brands. A displayed COA is only useful if it matches the physical vial you receive.
Verify #6 - Testing-lab accreditation for whichever supplier you choose. None of the labs referenced across these listings - LabFreedom Diagnostics, Freedom Diagnostics, Ethos Analytics, or Bioviridian - was independently authenticated for this article.
Verify #7 - Sourced Peptides' review-count discrepancy (10,247 vs. 3,841 on the same page). Ask the brand directly which figure is current if the review volume factors into your evaluation.
Fast Facts: GLP-3R Across the Three Suppliers Compared
Compound: GLP-3R / GLP-3(R), 39-residue synthetic peptide, research-use-only across all three brands
Sourced Peptides price: $109.69 per vial, all sizes (5mg/10mg/30mg); bundle $318.83
Nationwide Peptides price: $43.00-$306.00, sized 5mg through 60mg
Pure Health Peptides price: from $57.00, sized 5mg through 30mg
Sourced Peptides listed purity: 99.745% (lot-specific, HPLC-UV + mass spec)
Nationwide Peptides listed purity: ≥98% (HPLC/MS)
Pure Health Peptides listed purity: ≥99% (HPLC certified)
LY3437943/retatrutide correspondence disclosed: Nationwide Peptides (yes), Pure Health Peptides (yes), Sourced Peptides (not in materials reviewed)
Legal entity disclosed on-site: Nationwide Peptides (National Science Labs, LLC), Pure Health Peptides (Pure Health Peptides LLC), Sourced Peptides (not disclosed beyond brand name)
KYC/buyer-verification gate: Pure Health Peptides (required pre-fulfillment), others (attestation-based only)
Free shipping threshold: Sourced Peptides (site-wide free), Nationwide Peptides ($200+), Pure Health Peptides ($175+)
Age-gate consistency: Nationwide Peptides and Pure Health Peptides (consistent 21+), Sourced Peptides (21+ gate vs. 18+ Terms - inconsistent)
Sourced Peptides current promotion: Buy 1 Get 1 Free on starter vials (brand-stated, time-limited)
Sourced Peptides confirmed domestic-only shipping (2-5 business days); Nationwide Peptides and Pure Health Peptides publish U.S. free-shipping thresholds but their international-shipping policies weren't independently confirmed for this article
Product-specific published research located via PubMed: none, for any of the three brands' commercial material specifically
Sourced Peptides review-count discrepancy: 10,247 displayed in one section vs. 3,841 in the rating breakdown, same page
Real-world research context: Eli Lilly's retatrutide (LY3437943) posted positive Phase 3 (TRIUMPH-1) topline results in May 2026; still investigational, not FDA-approved
Buyer Verification Checklist
Request the lot-specific COA matched to the exact lot that will ship with your order, from whichever supplier you choose - not just the COA displayed generically on the product page.
Confirm in writing which refund policy governs your order if you're purchasing from Sourced Peptides, given the badge/Terms conflict documented above.
Confirm the minimum purchase age that applies to your order directly with the supplier if the 21-vs-18 inconsistency on Sourced Peptides' site matters for your records.
Ask for the full registered legal entity name behind any supplier your institution is purchasing from, for your own compliance and accounts-payable documentation.
Verify testing-lab accreditation independently if third-party verification matters for your research documentation - none of the three labs referenced here was authenticated for this article.
Confirm current pricing and any active promotion directly on the live site before finalizing an order, since all three note pricing and offers are subject to change without notice.
Check the current shipping timeline and domestic-only restriction with your chosen supplier if you're ordering from outside the continental U.S. delivery window.
Confirm current GLP-3R pricing and lot details at Sourced Peptides
Frequently Asked Questions
Is GLP-3R approved by the FDA?
No. GLP-3R isn't an FDA-approved drug, and none of the three suppliers compared in this article - Sourced Peptides, Nationwide Peptides, or Pure Health Peptides - market it as one. All three market it exclusively as a research compound for laboratory use, and each site states the product isn't intended to diagnose, treat, cure, or prevent any disease. No FDA clearance, approval, or authorization was confirmed in the materials reviewed for this article for any of the three brands.
Is GLP-3R the same thing as retatrutide?
Two of the three suppliers reviewed here say GLP-3R's structural characteristics correspond to LY3437943 (retatrutide), Eli Lilly's investigational triple-receptor compound, while explicitly clarifying that the research material sold isn't the investigational drug product itself. Sourced Peptides' own listing doesn't use either term. This article did not independently verify sequence-level identity between any supplier's commercial vial and the compound studied in Eli Lilly's clinical trials - treat any supplier's naming or non-naming as a brand-level disclosure choice, not independent confirmation either way.
Can GLP-3R be used for weight loss or another personal health purpose?
No, according to every brand's own materials reviewed for this article. Sourced Peptides, Nationwide Peptides, and Pure Health Peptides all state across their product pages, footers, and terms that their versions of this compound aren't for human or animal consumption and are intended strictly for research and laboratory use. This article doesn't present it, and none of the three brands markets it, as a weight-loss or health product for individual use. If you're here because you read about retatrutide's clinical trial results and are hoping to source something similar for personal use, that's not what any of these three listings are selling, and none of them will provide dosing guidance for that purpose - each brand's own materials say so directly.
Who does each brand say can purchase GLP-3R?
Sourced Peptides and Nationwide Peptides both use a purchase-time attestation model, requiring buyers to represent themselves as qualified researchers or professionals who understand the product's nature. Pure Health Peptides goes further, requiring KYC (know-your-customer) verification before fulfilling any order and reserving the right to refuse orders that don't meet its buyer-qualification criteria. All three require purchasers to be at least 21, though Sourced Peptides' own Terms & Conditions separately state a minimum age of 18 (with parental consent if under 18) - which doesn't match its site's 21-plus age gate, as covered above.
What does Sourced Peptides' Certificate of Analysis for GLP-3R show?
Per the brand, the current lot's COA shows 99.745% purity by HPLC-UV, with mass spectrometry confirming the expected ion at [M+3H]³⁺ 1578.05 m/z, attributed to a lab named LabFreedom Diagnostics, with a specific accession number (2603100041) and lot number (030622026REE34) listed. Sourced Peptides makes the certificate downloadable directly from the product page, and states the document covers the exact lot a buyer will receive. This article hasn't authenticated the lab, verified its accreditation, or independently repeated the testing behind the figures displayed.
How does Sourced Peptides' purity documentation compare to Nationwide Peptides and Pure Health Peptides?
Sourced Peptides publishes a lot-specific figure (99.745%) along with a named testing lab, LabFreedom Diagnostics, and a specific accession and lot number. Nationwide Peptides states a purity threshold (≥98%) and names Freedom Diagnostics as its testing partner on its dedicated COA page. Pure Health Peptides states ≥99% purity and names Ethos Analytics as its testing partner on one page. A separate Certificate of Analysis image on the same domain for a different product identifies Bioviridian; that separate document does not establish which laboratory tested the current GLP-3(R) lot. None of the labs named across the three brands was independently authenticated for this article.
Does Sourced Peptides ship internationally?
No. Per the brand's shipping information, GLP-3R and other listed compounds ship domestically within the United States only at this time, with no stated timeline for expanding coverage. This article did not locate or review a dedicated international-shipping policy page for Nationwide Peptides or Pure Health Peptides, so if you're purchasing on behalf of an institution outside the U.S., confirm directly with whichever supplier you're considering before assuming coverage either way, since shipping policies can change without much advance notice.
What's the price difference between the three suppliers?
Sourced Peptides charges a flat $109.69 per vial regardless of size (5mg, 10mg, or 30mg), with a bundle at $318.83. Nationwide Peptides prices by size across a wider range, from $43.00 for its smallest listed size up to $306.00 for its largest. Pure Health Peptides starts at $57.00 and also prices by size across five options. Confirm current pricing directly on each live site, since all three state pricing is subject to change without notice.
Do any of these suppliers require special buyer verification?
Pure Health Peptides requires KYC (know-your-customer) verification prior to order fulfillment and reserves the right to refuse orders that don't meet its buyer-qualification criteria, describing its buyers as "qualified research professionals and institutional users" specifically. Sourced Peptides and Nationwide Peptides rely on a purchase-time attestation and age-gate model instead - you confirm you're 21-plus and understand the research-only nature of the product, but neither describes an identity-verification step comparable to Pure Health Peptides' in the materials reviewed for this article.
Is there independent published research specific to GLP-3R?
Not that this article was able to confirm for any of the three suppliers' specific commercial products. A structured PubMed search conducted while researching this article didn't surface studies referencing "GLP-3R" by name tied to any particular brand's vial. Two of the three brands tie the compound generally to LY3437943/retatrutide research literature, which is a real and active clinical research area, but that's a description of the general field - not a citation to product-specific published data for any supplier's commercial material.
Check today's GLP-3R lot number and COA at Sourced Peptides
What's actually in the vial, according to each brand?
Per each brand's own COA and product specifications: Sourced Peptides lists 99.745% purity for the current lot, with no additional excipients disclosed on the pages reviewed; Nationwide Peptides lists ≥98% purity with a stated acetate salt form; Pure Health Peptides lists ≥99% purity as a lyophilized white powder. The suppliers publish brand-specific storage information beyond composition. This article does not reproduce or validate those instructions; qualified laboratory personnel should consult the documentation for the exact lot received and follow institutionally approved protocols. This article hasn't independently authenticated any of the three compositions beyond what's displayed on each brand's own certificate and product page.
Are there complaints or documented inconsistencies across these suppliers?
The brand-hosted reviews on Sourced Peptides' product page are mostly positive, with a couple mentioning slower-than-typical support response times and one noting cosmetic shipping-box damage with no effect on the product. The more notable pattern on Sourced Peptides specifically isn't in the reviews - it's the site-level inconsistencies covered throughout this article: mismatched refund-policy language, conflicting minimum-age requirements, two different displayed review counts on the same page, and the absence of a disclosed legal entity name. Nationwide Peptides and Pure Health Peptides didn't show comparable internal inconsistencies in the materials reviewed for this comparison.
Why is this specific research-peptide category getting more attention right now?
Eli Lilly's retatrutide (LY3437943) program - the pharmaceutical compound two of the three suppliers tie their listings to - posted positive Phase 3 topline results (TRIUMPH-1) in May 2026, with additional trial data reported through mid-2026. That's real, current pharmaceutical news, and it's a plausible overlapping explanation for increased research-market interest in triple-agonist peptides generally, though this article did not establish a direct causal link between that news and any specific supplier's traffic or sales. Retatrutide remains investigational and is not FDA-approved; any future filing or approval timeline is uncertain unless and until Eli Lilly or the FDA formally announces it. None of this says anything about the accuracy, purity, or safety of any specific research-chemical supplier's vial - those remain separate questions, addressed brand-by-brand above.
Does the brand list a separate laboratory reconstitution reagent?
Yes, for at least one of the three. Sourced Peptides' product page lists a 10mL bacteriostatic-water product as a separate $9.97 add-on, offered alongside the peptide vial at checkout. Nationwide Peptides likewise lists a bacteriostatic-water add-on in its "frequently bought together" section. Any preparation, handling, storage, or experimental protocol involving these reagents should be governed exclusively by an institutionally approved research protocol and qualified laboratory personnel - this article doesn't provide reconstitution instructions for any brand's product and isn't a substitute for your own lab's procedures.
Which supplier publishes a registered legal entity name and phone number?
Based on the materials reviewed, Nationwide Peptides (National Science Labs, LLC, with a published support phone number of (844) 480-0111) and Pure Health Peptides (Pure Health Peptides LLC, with specific FD&C Act Section 503A/503B regulatory-role language) both publish an operating entity name on the reviewed pages. Sourced Peptides' reviewed pages reference only the "Sourced Peptides" brand name without a separate registered legal entity, phone number, or street address. If a documented legal entity matters for your institution's vendor records, request it directly from Sourced Peptides before placing an order, since it isn't published on the pages this article reviewed.
Preview Sourced Peptides' current GLP-3R lot pricing and vial options
Sourced Peptides Contact Information
Contact details per brand, as publicly listed:
Sourced Peptides: email [email protected]; no phone number or specific street address was published on the pages reviewed for this article; the site lists its operating location only as "United States"; the shipping-information page states orders are processed Monday through Friday, excluding major holidays
Nationwide Peptides: operated by National Science Labs, LLC; publishes a support phone number, (844) 480-0111
Pure Health Peptides: operated by Pure Health Peptides LLC; publishes email-based support without a listed phone number in the materials reviewed
Confirm current contact details and support hours directly with whichever supplier you choose.
The Bottom Line
All three suppliers reviewed here - Sourced Peptides, Nationwide Peptides, and Pure Health Peptides - are upfront, repeatedly and consistently across their sites, that GLP-3R (or GLP-3(R)) is a research-use-only material and not a product intended for human consumption. That's the framing to take at face value across the board. Where they differ is in the details documented throughout this article: Sourced Peptides publishes a lot-specific purity result and accession number but doesn't publish a registered legal entity name, and its own site carries a refund-policy conflict and an age-requirement conflict that this article documents rather than resolves for you. Nationwide Peptides publishes a wider size range and a named entity with phone support, along with an explicit tie to the retatrutide research literature. Pure Health Peptides states that it requires a KYC verification step and publishes explicit regulatory-role language under specific FD&C Act sections.
None of this is a ranking of which supplier to choose: it depends on what matters most for your specific purchase: documentation granularity, pricing structure, buyer-verification requirements, or entity transparency. What's consistent across all three is that this article hasn't authenticated any of the labs named or described, verified chain of custody for any vial, or independently confirmed any brand's manufacturing-facility claims. Confirm directly with whichever supplier you choose before you order.
View GLP-3R's current listing and lot documentation at Sourced Peptides
Disclosure and Compliance Information
Material Limitations: This article is based on a live review of Sourced Peptides' product page, Terms & Conditions, and shipping-information page, and comparative live review of Nationwide Peptides' and Pure Health Peptides' product pages, all conducted July 15-16, 2026. No product testing was performed by this publication for any brand discussed. Brand claims regarding purity, testing methodology, manufacturing, and research applications are not independently verified and are presented as attributed to each brand. Identified discrepancies in Sourced Peptides' own published materials - refund-policy language, minimum-age requirements, review counts - are documented above rather than resolved unilaterally. No published, product-specific research for GLP-3R was located via PubMed for any of the three brands' commercial products at the time of research. A full registered corporate entity name beyond "Sourced Peptides" was not confirmed on the pages reviewed. Contact each brand directly to verify any material claim.
Affiliate Disclosure: A commission is earned if a purchase is made through the Sourced Peptides links in this article. The affiliate link redirects through a third-party intermediary domain to the brand's product listing. Nationwide Peptides and Pure Health Peptides are discussed for comparison purposes only; no affiliate relationship with either of those two brands is disclosed or implied by this article.
Third-Party Feedback Platforms: The accuracy of third-party review platforms and brand-displayed reviews is not independently endorsed. Readers are encouraged to evaluate such feedback critically across all brands discussed.
Research Use Disclosure: GLP-3R and GLP-3(R), as sold by all three brands discussed in this article, are marketed for qualified research use only. None are intended for human consumption, therapeutic application, or medical use of any kind. Researchers and purchasers are responsible for ensuring compliance with all applicable institutional, local, state, and federal regulations governing the purchase, possession, and use of research peptides in their jurisdiction. Nothing in this article should be read as an endorsement or suggestion of human use of any product discussed.
California Consumer Disclosure: No product-specific California Proposition 65 warning was identified in the materials reviewed for Sourced Peptides, Nationwide Peptides, or Pure Health Peptides. California buyers with questions about California-specific chemical disclosures should confirm directly with each brand before purchase.
Forward-Looking Statements: This article reflects information available as of July 16, 2026. Pricing, promotional offers, lot-specific COA data, shipping terms, and site policies for all three brands discussed are subject to change without notice. Readers should rely on each brand's official site for current information. Clinical trial information regarding Eli Lilly's retatrutide program reflects publicly reported data as of this article's research date and is subject to change as the program progresses.
Marketing Language Notice: Descriptive phrases such as "next-gen triple-receptor" and references to specific receptor pathways are brand-asserted marketing and product-description language from the respective brands, not independent scientific rankings, certifications, or lab-verified performance claims by this publication.
Trademark Acknowledgment: Sourced Peptides, Nationwide Peptides, Pure Health Peptides, and associated product names are trademarks or brand names of their respective owners. No registered trademark status was confirmed via USPTO TESS search for any brand at the time of this article; no ® designation is used above for that reason. Retatrutide and the LY3437943 designation are associated with Eli Lilly and Company's investigational drug program and are referenced here for research-context purposes only. Nationwide Peptides and Pure Health Peptides are referenced in this article solely for factual, comparative purposes under nominative fair use; no endorsement, partnership, or sponsorship by either brand is implied.
Geographic and Jurisdictional Notice: Product availability, shipping eligibility, and legal purchase requirements for research peptides vary by state and country. This article doesn't constitute legal advice on the legality of purchasing or possessing any product discussed in any specific jurisdiction. Confirm applicable local, state, and federal law directly.
SOURCE: Sourced Peptides