Pepsynth Labs
A permanent record of what we could see on 2026-09-17. Share it, cite it, or download it.
US-based research peptide seller claiming cGMP manufacturing without accessible third-party COAs.
Pepsynth Labs is an online seller based in Cheyenne, Wyoming, offering research peptides in lyophilized powder form. The site claims products are manufactured in cGMP facilities in the USA and tested by independent third-party labs for >99% purity. However, no third-party lab reports or Certificates of Analysis are available to view on the website. Shipping is limited to the United States.
Confidence: high · 6 pages read · 0 documents opened · 2026-09-17 08:57 UTC
We could read most of what matters, lab evidence included.
Good. Right on the median of the 125 research suppliers we have scored (6.0).
- Strong8.0 – 10
- Good6.5 – 7.9
- Mixed5.0 – 6.4
- Weak0 – 4.9
- 1No batch-specific third-party laboratory test reports are provided or linked on the website to verify identity, purity, or quantity.
- 2The site states products are produced in cGMP facilities and tested by third parties, but provides no verifiable lab documentation or facility details.
Third-party test reports: are they recent, lot-linked, and do they use methods that can actually prove identity and amount?
- Published test reportsFlagged
We found no certificate or test-report links anywhere we could read on the site. For a research-use seller this is the single most important thing to publish.
- Reports tied to a lotNot visible
No documents to trace back to a batch.
- What the reports sayFlagged
Mentions independent third-party testing and Certificates of Analysis (COAs), but no lab reports are published or linked on the site.
- Analytical methodFlagged
Claims >99% purity verified through independent testing, but provides no lab certificates or analytical method details (such as HPLC or MS).
- Named third-party labClear
The site names an outside lab we recognise: peptide test.
- Document recencyNot visible
The documents carry no date we could read from the server.
Third-party ratings and public threads, read directly at the moment of this check. They are easy to buy and easy to brigade, so they are weighted low and can never overturn a lab-evidence flag. Every source below is also logged in the evidence trail.
Trustpilot did not answer, so we treat their reputation there as not visible.
Read 2026-09-17 08:57 UTC
No Google rating we could read from here. Google blocks automated reads, so open the link and judge it yourself.
Read 2026-09-17 08:57 UTC
No public community discussion we could read. Silence is not a verdict either way.
Read 2026-09-17 08:57 UTC
Every claim in this report traces to one of the items above. Expand a row to see the material it is based on.
The score is a weighted mean over the pillars we could actually read — 88% of the model on this run. Anything we could not see is left out of the maths rather than counted against the seller.
Model weight 34% · pillar score 2.5/10 · 1 ok, 3 flagged, 2 unseen
Model weight 24% · pillar score 10.0/10 · 6 ok, 0 flagged, 1 unseen
Model weight 18% · pillar score 6.7/10 · 2 ok, 1 flagged, 0 unseen
Model weight 12% · pillar score 6.7/10 · 2 ok, 1 flagged, 0 unseen
Model weight 12% · nothing readable · 0 ok, 0 flagged, 3 unseen
Reputation is deliberately the lightest pillar. Even a perfect rating cannot lift a report over a lab-evidence flag.
Paste the citation straight into a paper or a reference manager. Both files carry the run identifier and the timestamp of this report.
MyDosage. MyDosage supply check: Pepsynth Labs (6.0/10). 2026-09-17. https://mydosage.com/c/a1b0b8f2-70f9-48a9-bb17-a9ac1789b9b8
The pack is one PDF: the verdict page plus an appendix of every cited page, document and social-proof source with the text we read. The data exports carry the same thing in machine form — inputs, every source with its timestamp and confidence weight, and the full scoring breakdown.
Whatever this report said, there are three ways to get what you need.
- 1Doctor + approved medicineA prescription and a pharmacy-dispensed product with a regulator's label.
- 2Clinic + licensed compounding pharmacyA prescriber and a pharmacy we checked against its licence register.
- 3Research-use-only supplierNo medical oversight. Only worth it when nothing approved exists yet.
Prices, oversight and typical wait are compared side by side for United States.