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Retatrutide: the published lot record

Quick answer

Peptara Labs has published one retatrutide lot, RETA-260512-A, at 99.18% HPLC purity on certificate COA-2026-6928, tested in June 2026 by Titreon Analytical, with a second bacterial endotoxin report from Janoshik. Retatrutide has no approved use anywhere. Both reports open on their laboratories’ own sites, so you can read them at the source before you buy.

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5 min readUpdated 15 September 2026Research and educational reading only

An unlabeled glass vial with a red cap
RetatrutideIllustrative image, not the product label
Research record

What retatrutide is, on the record

A compound in phase 3 development, described here by its registration record and study types only.

What it is

Retatrutide, development code LY3437943, is a synthetic peptide that activates the GIP, GLP-1 and glucagon receptors. It is in development for obesity and type 2 diabetes, and Eli Lilly and Company is the lead sponsor on its registered studies.

Sources: PubMed 35985340, ClinicalTrials.gov NCT06354660

Approval status

Retatrutide has no approved use, and phase 3 trials are underway. Thirty-three registered studies matched the compound when the register was read on 1 September 2026, and Peptara Labs sells it as research-grade material.

Sources: PubMed 41090431, ClinicalTrials.gov register

Evidence on the record

The strongest evidence on the record is phase 2 randomized, placebo-controlled trials, one in adults with obesity and one in adults with type 2 diabetes. This guide reports no results from either and gives no guidance on use.

Sources: PubMed 37366315, PubMed 37385280

Registered studies

Published lot

Lot RETA-260512-A, and what its certificate covers

Published recordAs published
Compound
Retatrutide
Lot
RETA-260512-A
Purity, HPLC
99.18%
Certificate
COA-2026-6928
Tested
June 2026
Laboratory
Titreon Analytical

As published by Peptara Labs, which describes Titreon Analytical as aligned to ISO/IEC 17025:2017, not itself accredited. This site has not tested this lot. Source: peptaralabs.io/coa

Seven checks on certificate COA-2026-6928

  • IdentityLC-MS with HPLC retention-time matching.
  • Purity, HPLCChromatographic purity against a release criterion of not less than 95.0 percent.
  • Net peptide contentHow much peptide the vial holds. This site prints no content figures.
  • SterilityWhether the batch showed growth.
  • Bacterial endotoxinReported by Titreon, and for some lots a second time by Janoshik.
  • Heavy metalsArsenic, cadmium, chromium, mercury and lead.
  • FentanylAn immunoassay screen.

Retatrutide is one of the lots that also carries a bacterial endotoxin report from a second laboratory, Janoshik, report number 195512, analysed on 30 June 2026. Its QR code opens the report on Janoshik’s own site, where this guide opened it on 15 September 2026.

Sources: peptaralabs.io/trust, peptaralabs.io/coa, the Peptara Labs website, read 14 September 2026

Before you buy

Before you buy Retatrutide

Five things to read before a retatrutide order, in the order a buyer meets them.

FAQ

Questions about Retatrutide

Which retatrutide lot has Peptara Labs published?

Lot RETA-260512-A, at 99.18% HPLC purity on certificate COA-2026-6928, tested in June 2026 by Titreon Analytical. It is the only retatrutide lot on the record this guide read on 14 September 2026.

Is retatrutide an approved medicine?

No. Retatrutide has no approved use. It is in phase 3 trials sponsored by Eli Lilly and Company, and Peptara Labs sells it as research-grade material.

Does the retatrutide lot have a report from a second laboratory?

Yes. Peptara Labs publishes a Janoshik bacterial endotoxin report, number 195512, for lot RETA-260512-A, analysed on 30 June 2026.

Does a retatrutide order include its certificate?

Peptara Labs says it does: “the batch certificate for what shipped” is on its list of what arrives. The published certificate for lot RETA-260512-A also opens on titreonanalytical.com.

Can I buy retatrutide over the counter in Vietnam?

Pharmacy and prescription rules are legal questions this guide does not answer. Peptara Labs covers the question on its page Are peptides legal in Vietnam?

Is retatrutide legal to buy in Vietnam? This guide does not give legal guidance. Peptara Labs covers it on its page Are peptides legal in Vietnam?

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Peptara Labs’ certificates

Three questions about the documents behind a Peptara Labs order. Each answer links its source. This site has not tested any product.

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Does Peptara Labs publish its certificates?

Yes, one per product on its certificates page, each from a recent batch with its lot code, HPLC purity and test date. Its website also lists the printed batch certificate for what shipped among what arrives.

Sources: peptaralabs.io/coa, the Peptara Labs website, read 15 September 2026

What does a Peptara Labs certificate test for?

By its description: identity by HPLC and LC-MS, HPLC purity against a 95.0 percent release criterion, net peptide content, sterility, bacterial endotoxin, heavy metals and a fentanyl screen.

Source: peptaralabs.io/coa

Can you check a Peptara Labs report on the laboratory’s own site?

Yes. Each Titreon certificate has a QR code and a printed key that open it on titreonanalytical.com, and each Janoshik endotoxin report opens on verify.janoshik.com. This guide checked both on 15 September 2026.

Sources: peptaralabs.io/coa, titreonanalytical.com, verify.janoshik.com