Retatrutide is an investigational triple agonist peptide developed by Eli Lilly — it is not FDA-approved, not a supplement, and not available by prescription outside of clinical trials. Research suppliers in the United States sell it for laboratory and in-vitro research purposes only, under a "not for human consumption" designation. The FDA has issued warnings about companies selling compounded or unapproved retatrutide; always source from vendors who label product for research use and provide verifiable third-party purity documentation.
With that context established: if you are sourcing retatrutide for legitimate research, the market has grown considerably in 2026. Vendor quality varies sharply. This page exists to give researchers a live, side-by-side cost and quality comparison — something no competitor currently offers.
Our top picks at a glance#
[Peptide Supply Co.](/peptide-supply-co-review/) is our featured recommendation. Their testing program — batch-specific HPLC COAs publicly accessible on a dedicated Lab Results page, 99%+ purity across the catalog, free 2-day US shipping, and a broad research catalog — makes them the most trustworthy all-around source for retatrutide research supply. They sell it under the research label "GLP-3 RT."
[Peptide Plugs](/peptide-plugs-review/) is a strong second choice, particularly if COA transparency and per-mg cost are the deciding factors. Their Freedom Diagnostics HPLC+MS COAs carry verifiable accession numbers and report 99.9%+ purity — the most rigorously documented testing in this comparison. Volume discounts make them especially competitive for multi-vial research protocols.
[Elite Research Lab](/elite-research-lab-review/) is a newer, budget-priced option that publishes per-batch Freedom Diagnostics COAs. It's transparent on paper but unproven — a roughly six-month-old domain, peer-to-peer-only payment, and no independent track record yet — so we rank it third. (Note: it is not the similarly-named eliteresearchusa.com, whose products have failed independent testing.)
How we rank vendors#
We evaluate every vendor on five criteria:
- Third-party COA quality. Who performed the test? Is there an HPLC chromatogram? Is a batch number or accession number present so the COA can be independently verified? Self-issued COAs without named labs score lowest.
- Purity percentage. Research-grade retatrutide should test at ≥98% purity. We flag any vendor where independent testing has found deviations from label claims.
- Cost per mg. We normalize all vial sizes to a cost-per-mg figure. Larger vials almost always reduce the per-mg rate — relevant for longer research protocols.
- Shipping and handling. US-based warehousing with tracked, discreet shipping reduces transit risk for temperature-sensitive lyophilized peptides.
- Accountability signals. Clear research-use labeling, verifiable contact information, an established reputation in the research community, and a money-back or replacement policy.
We do not accept payment or free product in exchange for placement. Affiliate links are disclosed; placement is editorial.
Retatrutide cost and projected price-per-month guide#
Understanding retatrutide pricing requires translating the per-mg unit cost into the context of a research protocol. The Phase 2 and Phase 3 clinical trials used a weekly subcutaneous injection titration schedule — commonly referenced in research as a stepwise ramp from a low starting dose up to a higher maintenance dose over several months. We cover the full titration schedule in our Retatrutide Complete Guide.
For research planning purposes, here is how per-mg costs map to illustrative monthly peptide cost across dose stages — based on reported research protocol ranges, not treatment recommendations:
Early titration stage (reported research range: approximately 2–4 mg per week)
At approximately 3 mg/week, a research protocol uses roughly 12–16 mg per month. At a per-mg cost of $4–$5 (achievable with mid-size vials from Peptide Plugs or Peptide Supply Co.), projected monthly peptide cost runs approximately $50–$80/month.
Mid titration stage (reported research range: approximately 6 mg per week)
At approximately 6 mg/week, monthly usage is roughly 24–26 mg. At $4–$5/mg, projected cost is approximately $100–$130/month. Purchasing a 30mg vial — available from all three vendors — reduces per-mg cost and is more efficient at this stage.
Higher titration stage (reported research range: approximately 8–12 mg per week)
At approximately 10–12 mg/week, monthly usage is roughly 40–50 mg. Multi-vial purchasing at volume-discount rates (e.g., Peptide Plugs' 10-vial pricing, which reaches approximately $2.50/mg) brings projected cost to $100–$125/month even at higher dose ranges — less than lower-dose single-vial purchasing from less efficient sources.
These figures are illustrative cost projections based on reported research protocols only. They are not dosing guidance, treatment instructions, or medical advice. Refer to the published trial literature and the Complete Guide for protocol context.
What to look for when buying retatrutide#
A named, third-party testing laboratory. The COA should name the lab that performed the analysis — not just the vendor's own quality team. Look for accreditation signals (ISO 17025) and, ideally, a verifiable accession or lot number you can cross-reference with the lab directly.
HPLC and/or mass spectrometry analysis. High-performance liquid chromatography (HPLC) and mass spectrometry (MS) are the standard methods for confirming both purity percentage and molecular identity. A COA that only lists a purity number without a chromatogram or spectral data provides weaker assurance.
Batch-specific documentation. Generic catalog COAs that apply to an entire product line are not meaningful. Batch-specific COAs, issued per production lot, are the standard for research-grade materials.
Research-use labeling. Product packaging and website copy should clearly state "for research use only" and "not for human consumption." This is both a regulatory compliance marker and a signal the vendor understands the legal framework around unapproved investigational compounds.
Reconstitution support. Lyophilized retatrutide requires reconstitution with bacteriostatic water (BAC water) before use. Vendors who provide clear reconstitution guidance — or link to it — demonstrate category knowledge. See our Retatrutide Complete Guide for a full reconstitution walkthrough.
Transparent pricing without hidden fees. Per-mg cost should be calculable from the listed price and vial size. Vendors who obscure unit pricing or hide shipping costs after checkout are a red flag.
Vendor reviews#
Peptide Supply Co. — Top Pick#
Overview. Peptide Supply Co. is a US-based research peptide supplier with a broad catalog and a particularly strong quality-assurance program. They market retatrutide under the research designation "GLP-3 RT," consistent with the common community shorthand for the compound. Their Lab Results page publishes batch-specific HPLC COAs accessible to anyone — no login required — with purity results at 99%+ across their catalog.
Pricing (June 2026 snapshot — live prices in the table above). Retatrutide (GLP-3 RT) is available across multiple vial sizes in a range of approximately $45–$200. Smaller vials are suitable for preliminary research; larger vials reduce per-mg cost for multi-dose protocols.
Testing and COA. Publicly accessible batch-specific HPLC COAs on a dedicated Lab Results page. 99%+ purity across the catalog. This is the most transparent testing program among the vendors reviewed here.
Shipping. Free 2-day US shipping, tracked and discreet. US-based warehousing.
Verdict. Best overall choice for researchers prioritizing a combination of testing transparency, shipping reliability, and sourcing accountability. Our featured recommendation.
Peptide Plugs — Best COA Transparency + Volume Pricing#
Overview. Peptide Plugs is a US-based (Texas) research peptide supplier offering retatrutide under the names "Reta" and "GLP3-RT." They distinguish themselves with Freedom Diagnostics laboratory HPLC+MS COAs that carry verifiable accession numbers — the most rigorously documented third-party testing in this comparison at 99.9%+ purity. They also offer a double money-back guarantee, which is unusual in this market.
Pricing (June 2026 snapshot — live prices in the table above). 10 mg: $65 ($6.50/mg) · 20 mg: $95 ($4.75/mg) · 30 mg: $125 ($4.17/mg). Volume discounts available; pricing reaches approximately $2.50/mg at 10+ vials — the lowest per-mg rate in this comparison at scale.
Testing and COA. Freedom Diagnostics (named accredited lab) HPLC+MS COAs with verifiable accession numbers. 99.9%+ purity. The accession number verification is a meaningful differentiator — researchers can independently confirm the test was actually performed.
Shipping. Same-day UPS Air Express (US). Payment via PayPal, Venmo, Zelle, CashApp.
Verdict. Best choice for researchers prioritizing COA verifiability and/or running multi-vial protocols where volume pricing matters. Slightly higher per-vial entry cost than some alternatives, but justified by testing quality. Strong second choice.
Elite Research Lab — Newer Budget Option#
Overview. Elite Research Lab (eliteresearchlab.com) is a US, veteran-owned vendor that carries research-grade retatrutide and publishes public, per-batch COAs from a named third-party lab.
Important — don't confuse the namesakes. The failing independent tests that circulate online for "Elite Research" — including a retatrutide sample reported to contain no active compound — belong to eliteresearchusa.com, a separate and unrelated company. They are not eliteresearchlab.com's results, and we do not attribute them here.
Pricing. Budget-tier, with volume discounts. Confirm the current price and cost per mg in the live table above before ordering.
Testing and COA. Public, per-batch COAs from Freedom Diagnostics (HPLC-UV purity + LC-MS identity), with accession and lot identifiers. Purity figures are vendor-published — we have not independently re-run an accession — and Freedom Diagnostics, while legitimate, is not the community-standard Janoshik.
The honest caveats. Elite is brand-new: the domain is only about six months old, there's no independent track record yet, payment is Zelle/Venmo only (no buyer protection), and all sales are final. The site's "10,000+ customers" claim is hard to reconcile with the domain age. These are reasons to start with a small order — not evidence of bad product.
Verdict. A transparent-on-paper budget option that is simply unproven. We rank it third — behind Peptide Supply Co. and Peptide Plugs — on track record and payment protection, not on testing posture.
Final verdict#
Peptide Supply Co. is our recommended vendor for retatrutide research supply. Their publicly accessible batch-specific COA program, 99%+ catalog-wide purity, free 2-day US shipping, and established track record make them the most trustworthy option for researchers who need reliable sourcing. Use the live table above to check current pricing and availability.
For researchers where per-mg cost or COA verifiability is the primary concern, Peptide Plugs is an excellent alternative — their accession-number-verifiable Freedom Diagnostics testing is the most rigorous independent documentation in this comparison, and their volume pricing is unmatched.
Comparing GLP-1 options? See retatrutide vs tirzepatide, where to buy tirzepatide, and our best peptides for weight loss guide.
Buying FAQ
Is retatrutide legal to buy in the United States?
Research-grade retatrutide is sold legally in the US by licensed research chemical suppliers as a "research use only / not for human consumption" compound. It is not a controlled substance under the DEA Controlled Substances Act. However, it is an unapproved investigational drug under FDA jurisdiction — meaning it cannot be legally sold for human use, therapeutic purposes, or clinical application outside of an FDA-authorized trial. Purchasing for legitimate laboratory research is legal; purchasing with intent to self-administer exists in a legally and ethically different category.
Is retatrutide FDA-approved?
No. As of mid-2026, retatrutide (developed by Eli Lilly, internal designation LY3437943) is not FDA-approved for any indication. It has completed Phase 2 trials and is in Phase 3 (TRIUMPH program) trials for obesity and type 2 diabetes. The FDA has specifically warned against companies selling compounded or unapproved retatrutide outside of authorized trials.
Can I buy retatrutide without a prescription or outside of a clinical trial?
Retatrutide is not available by prescription — no approved prescription product exists. Outside of a clinical trial, it is only available from research chemical suppliers for non-human, non-clinical research purposes. If you are interested in participating in a retatrutide clinical trial, ClinicalTrials.gov lists active TRIUMPH program enrollments.
Where can I get retatrutide near me?
Retatrutide is not dispensed at pharmacies or clinics in the US — no approved or compounded prescription form exists legally. Research-grade retatrutide ships from US-based suppliers (all three vendors reviewed here are US-based) with tracked delivery, typically within 1–3 business days.
How much does retatrutide cost per month for research?
Monthly cost depends on dose stage and vial-size efficiency. Based on reported research titration protocols, projected monthly peptide cost ranges from approximately $50–$80/month at early titration ranges to $100–$130/month at mid-range doses, with volume purchasing capable of holding cost flat or lower even at higher dose ranges. See the cost guide section above for a full breakdown. All figures are research context estimates, not treatment cost projections.
How do I verify a vendor's COA?
A trustworthy COA will: (1) name the testing laboratory explicitly, not just the vendor; (2) include a lot or batch number matching the product you received; (3) show an HPLC chromatogram or mass spec data — not just a purity percentage; and (4) ideally include an accession number you can submit directly to the lab to confirm the test was performed. Peptide Plugs' Freedom Diagnostics COAs include verifiable accession numbers. Peptide Supply Co.'s Lab Results page publishes batch-specific COAs publicly. Be skeptical of any COA that lacks a named third-party lab.
How should I store retatrutide?
Lyophilized (freeze-dried) retatrutide should be stored in a freezer (−20°C) and kept away from light until reconstitution. After reconstitution with bacteriostatic water, store refrigerated (2–8°C) and use within the window specified by the supplier — typically 4–6 weeks. See the Complete Guide for reconstitution instructions.
Sources
Research use only. [peptide:retatrutide] is an investigational compound not approved by the FDA for any therapeutic use. It is sold by research suppliers for in-vitro and laboratory research purposes only and is not intended for human consumption, self-administration, or clinical use. The FDA has warned against companies selling compounded or unapproved retatrutide. Nothing on this page constitutes medical advice, dosing guidance, or an endorsement of any therapeutic application.
This page contains affiliate links. When you purchase through our links, we may earn a commission at no additional cost to you. Affiliate relationships do not influence vendor rankings or editorial assessments — placement is based on the criteria described above. Prices shown are June 2026 snapshots; the live table reflects current pricing.