First issue: a baseline. From tomorrow, each issue reports what changed since the day before. Source: Finnrick’s public data summary, snapshot of 21 October 2026. Results are information, not endorsements or medical advice.
The headline
Finnrick has published 12,626 independent tests across 35 peptides and 499 vendors, 709 of them in the last four weeks. Of the tests that could be scored, 70% passed its default standard (purity at least 99.5%, fill within 35% of the label) and 30% failed. Roughly one vial in three does not match its label to that standard.
Pass rates by product
| Peptide | Tests | Pass rate | Vendors tested | Latest test |
|---|---|---|---|---|
| GHK-Cu | 1,001 | 86% | 153 | 20 Oct |
| Tirzepatide | 2,845 | 78% | 277 | 20 Oct |
| Retatrutide | 4,656 | 77% | 407 | 21 Oct |
| Ipamorelin | 454 | 68% | 93 | 12 Oct |
| Semaglutide | 381 | 67% | 74 | 12 Oct |
| PT-141 (bremelanotide) | 157 | 65% | 46 | 12 Oct |
| Melanotan II | 183 | 62% | 45 | 12 Oct |
| Cagrilintide | 207 | 54% | 46 | 20 Oct |
| BPC-157 | 938 | 50% | 149 | 21 Oct |
| Tesamorelin | 743 | 48% | 113 | 20 Oct |
| TB-500 | 293 | 39% | 60 | 20 Oct |
| MOTS-c | 87 | 34% | 22 | 12 Oct |
| CJC-1295 | 337 | 29% | 70 | 15 Oct |
| NAD+ | 71 | 24% | 21 | 12 Oct |
Comment
- The big sellers test best. The two most-tested peptides, retatrutide and tirzepatide, pass about 77–78% of the time. High volume brings more testing, and testing pushes quality up.
- The “healing” peptides test worst. BPC-157 passes only half the time, TB-500 under 40%, CJC-1295 under 30%. These are among the most popular peptides with the weakest clinical evidence, so the buyer is uncertain about both the product and the science.
- A fail is not always a bad product, and a pass is not a safe one. The 99.5% purity bar is strict, so many failures are underfilled or slightly impure vials rather than the wrong substance. And none of these figures include endotoxin, which is the main danger in an injection and is only tested when someone pays for it.
- One batch is one batch. A seller’s pass rate tells you about past batches. Only the certificate for the batch in your hand, checked at the issuing lab, tells you about that vial.
How to check a certificate, and what each test measures: Peptide Testing.
genetec.io does not sell peptides, recommend vendors or link to shops. Most of these products are not registered medicines in South Africa or the United States; speak to a registered doctor before using any of them.