No vendor sells FDA-approved retatrutide — the compound is in Phase 3 and Eli Lilly has not submitted for approval as of May 2026, so every retatrutide listing is research-grade. Among research-peptide vendors with current listings: Prime Research Peptides has the lowest per-mg price ($8.50/mg flat 10–50 mg), Swiss Chems ships internationally with published COAs and a verified 10% coupon, and Particle Peptides (EU) carries Liquilabs-tested batches under the "GLP-3" alias.
Regulatory state in May 2026
Retatrutide is in Phase 3. The TRIUMPH-1 through TRIUMPH-4 readouts have published; TRIUMPH-5 (cardiovascular outcomes) is enrolling. Eli Lilly's investor communications through Q1 2026 indicated a 2026 FDA submission target, which puts a possible approval decision in late-2026-to-mid-2027. Until then, there is no FDA-approved retatrutide product available for purchase under any brand.
Every retatrutide vial currently sold is a research-grade peptide product. This article does not endorse human use of those products. It documents the observable market — current pricing, current COA practice, vendor status — so buyers can verify what they are actually purchasing. For the published dose levels used in trials see /articles/retatrutide-dosing-protocols; for the side-effect profile reported in the TRIUMPH program see /articles/retatrutide-side-effects.
Current vendor listings
Sorted by per-mg ascending. Pricing snapshotted from each vendor's public catalog on the date noted; the live table is refreshed daily at /peptides-index.
| Vendor | Vial | Price | Per-mg | COA practice |
|---|---|---|---|---|
| Prime Research Peptides | 10 mg | $85 | $8.50/mg | No public /coa route; testing claimed, documents not surfaced |
| Prime Research Peptides | 20 mg | $170 | $8.50/mg | No public /coa route |
| Prime Research Peptides | 30 mg | $255 | $8.50/mg | No public /coa route |
| Prime Research Peptides | 40 mg | $340 | $8.50/mg | No public /coa route |
| Prime Research Peptides | 50 mg | $425 | $8.50/mg | No public /coa route |
| Swiss Chems | 30 mg | $259.95 | $8.66/mg | Per-product COAs published; coupon VIALAUDIT10 (10% sitewide) |
| Swiss Chems | 20 mg | $215.94 | $10.80/mg | Per-product COAs published |
| Particle Peptides | 10 mg | $121.78 | $12.18/mg | 4 Liquilabs batches published; sold under "GLP-3" alias; coupon PARTICLE10 |
| Swiss Chems | 10 mg | $179.95 | $17.99/mg | Per-product COAs published |
| Swiss Chems | 5 mg | $149.95 | $29.99/mg | Per-product COAs published |
Last checked: 2026-05-23. The Janoshik public mirror currently holds 57 retatrutide tests (56 passed) submitted by upstream brands; Ascension Peptides surfaces 4 retatrutide COAs in its catalog mirror; Particle Peptides surfaces 4 Liquilabs batches. None of the clients on the Janoshik mirror are the three vendors above — Janoshik tests are typically submitted by raw-material suppliers and downstream brands, not the vendor of record.
What to check before ordering
A short list. Do every step before placing the first order with any vendor in the table above.
- Per-batch COA published. The product page should link to a COA for the batch you are receiving, dated within the last 12 months, from an independent third-party lab (Janoshik, Liquilabs, Anresco, or equivalent).
- COA verifier. Run the published COA through /tools/coa-verifier — the tool cross-references the lab's public mirror where one exists and flags any COA that does not resolve.
- Vendor audit profile. Open the vendor's
/vendors/<slug>/legitpage (e.g. /vendors/swiss-chems/legit) for the current verdict, the documented pros and cons, and the COA-practice score. - Active coupons. Check /coupons before checkout — Swiss Chems carries VIALAUDIT10 (verified 2026-05-22) and Particle Peptides carries PARTICLE10. Coupons are noted under the vendor rows above but do not re-order the table.
The editorial firewall on this article: vendor ordering is per-mg ascending only. There is no paid placement, no sponsored ranking, and no affiliate weighting. Coupons are noted because they materially affect the price the buyer pays; they do not move a vendor up the table.
Related reading
- TRIUMPH-4 Phase 3 retatrutide results — the trial-data backdrop, including the ~24% weight-loss headline and the FDA submission timeline.
- Retatrutide dosing protocols — the literature dose math from the published trials.
- Retatrutide side effects — the side-effect profile reported in TRIUMPH Phase 3.
- How to verify a Janoshik COA — the verification step every retatrutide buyer should do before ordering.
- Three vendors closed in 12 months — the post-shutdown pattern, including Amino Asylum.
Frequently asked
Is retatrutide legal to buy?
Retatrutide is not a controlled substance, so possession is not criminalised at the federal level in the United States. It is however not FDA-approved for any indication, so vendor sales are framed as "research use only" and not as a treatment supply. Importing internationally-shipped retatrutide is at the buyer's risk of customs seizure. See /tools/peptide-legality for the per-compound legality status table.
Is research-grade retatrutide the same as the pharmaceutical?
Chemically the active peptide is the same molecule. Operationally they are not equivalent. Research-grade vials carry no Eli Lilly identity-verification chain, no pharmacy-level sterility validation, and no human-use labelling. Purity and dose accuracy depend entirely on the per-batch COA the vendor publishes. Vendors that do not publish per-batch COAs are not verifiable.
How do I verify a retatrutide COA?
Paste the vendor-published COA URL or upload the PDF into /tools/coa-verifier. The tool cross-references the lab (Janoshik, Liquilabs, or equivalent), the batch ID, and the test date against the lab's public mirror where one exists. Janoshik currently has 57 retatrutide tests in our public mirror; Particle Peptides surfaces 4 Liquilabs batches; Ascension publishes 4. Any COA that does not appear in the lab's public index should be treated as unverified.
Which vendor has the lowest per-mg price?
Prime Research Peptides at $8.50/mg flat across the 10/20/30/40/50 mg vials, based on the May 2026 pricing snapshot. Swiss Chems is next at $8.66/mg (30 mg vial) before the VIALAUDIT10 coupon applies. Particle Peptides sits at $12.18/mg on the 10 mg vial. Per-mg leadership rotates with vendor pricing changes — the live ordering is at /peptides-index.
What are the risks of buying compounded retatrutide?
Three substantive risks. (1) Identity — without mass-spec confirmation on the batch COA, you do not know the vial contains retatrutide rather than a labelled-mismatch peptide. (2) Dose accuracy — Particle Peptides 2024-vintage Apigenex assays measured 70–80% of label content on multiple SKUs; 2025+ Liquilabs assays met label. (3) Vendor closure — Amino Asylum shut down in June 2025 with thousands of un-shipped orders. Verify the COA and the vendor's audit profile before each order.