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Provisional
Peptide Sciences
Defunct USDEFUNCT — shut down 2026-03-06. Historically a major US vendor, but criticised for internal-only CoAs. Included as a historical reference, not a buying option.
Coverage
35%
Verified 4/10 of 10 criteria · checked 2026-07-09
Provisional score. Under half of the weighted criteria could be verified for this vendor, so treat the score as indicative only. Missing evidence counts against coverage, not toward a passing grade.
Defunct vendor. This brand has closed or been seized. Its score is historical only and it is not a buying reference. Any site trading under this name today is unverified.
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DEFUNCT — closed 2026-03-06; the domain now shows a static farewell notice. Historically a major US vendor but criticised for internal-only CoAs and no named independent lab. Included as a historical reference, not a buying option. Look-alike sites (peptidesciences.shop…) are fraudulent.
Criterion-by-criterion evidence
Every score below is a recorded, dated observation. Where we could not verify a claim, the criterion is marked Unverified and excluded from the score (but it still counts against coverage).
| Criterion | Wt | Finding | Evidence |
|---|---|---|---|
| Publishes CoAsThe vendor publishes at least one certificate of analysis (CoA) on its own website. | 3 | ? Unverified | Not verified — no evidence on record. |
| Batch-level CoAsCoAs are tied to a specific batch/lot number, not a single generic certificate per product. | 3 | ? Unverified | Not verified — no evidence on record. |
| Third-party lab namedThe name of the laboratory that ran the analysis appears on the CoA. | 2 | ✘ No | Review consensus: in-house testing, no documented independent lab named. Source · 2026-07-09 |
| Independent / accredited labThe lab is independent of the vendor and/or accredited (ISO 17025), or is a recognised independent peptide lab (e.g. Janoshik, MZ Biolabs). | 2 | ✘ No | Reviews: "internal quality documentation rather than independent verification"; no ISO/Janoshik/MZ link. Source · 2026-07-09 |
| CoA verifiable at sourceThe CoA can be authenticated on the laboratory's own website (e.g. a verification code) — actually tested, not just claimed. | 2 | ? Unverified | Not verified — no evidence on record. |
| Identity + purity methodsWhich analytical methods are identifiable on the published CoAs. | 2 | ? Unverified | Not verified — no evidence on record. |
| Freshness of the latest CoADate of the most recent CoA visible on the site. | 2 | ? Unverified No dated CoA | No live dated CoA accessible as of 2026-07-09 (site closed). Source · 2026-07-09 |
| CoAs accessible before purchase, no accountCoAs can be viewed without a customer account or a prior purchase. | 2 | ? Unverified | Not verified — no evidence on record. |
| Sterility / endotoxin data publishedSterility or endotoxin (LAL) results are published in addition to purity. | 1 | ? Unverified | Not verified — no evidence on record. |
| Public complaints / recall handlingA public recall/complaint policy, or documented handling of a disputed batch. | 1 | ✘ No | No recall/complaint policy; closed without notice or order instructions. Source · 2026-07-09 |
Full scoring rubric on the methodology page. How affiliation is handled: read the disclosure.
Frequently Asked Questions
Is Peptide Sciences legit?
Peptide Sciences is no longer an operating vendor and should not be used as a buying reference. Any site trading under this name today is unverified. Historically it scored 0/100 on documentary transparency.
Does Peptide Sciences publish third-party CoAs?
No longer. The company closed in March 2026 and no live dated CoA is accessible. Historically it relied on internal quality documentation rather than a named independent lab.
How is the Peptide Sciences transparency score calculated?
We score 10 weighted, evidence-backed criteria. Score = 100 × Σ(weight × points) ÷ Σ(weight of verified criteria); coverage = verified weight ÷ total weight. Affiliated and non-affiliated vendors use the exact same rubric.