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Is Peptide Sciences legit?
Peptide Sciences is no longer operating. The site ceased on 2026-03-06 (Quality collapse on retatrutide batches over 15 months culminated in counterfeit detection by Janoshik; federal pressure followed; operations ceased). Do not order. We keep this audit public because the legitimacy question still surfaces in search — buyers deserve a clear answer rather than a 404.
Signal table
What works, what does not
- +Historical: most-recommended vendor on r/Peptides through 2024 and into 2025
- +Historical: broad catalog including the GLP-1 mainstream
- +Historical: published Janoshik COAs on most batches
- −Permanently offline since March 6, 2026
- −37 retatrutide samples failed Janoshik purity claims between Dec 2024 and Mar 2026
- −At least one batch was flagged by Janoshik as a counterfeit (mass-spec identity mismatch)
- −Federal pressure followed the quality collapse
What we mean by "legit"
We do not use "legit" as a single yes-or-no signal. A vendor is legit when four things hold: identifiable corporate operator, third-party or independently-mirrored COAs, shipping and payment infrastructure that consistently delivers, and a complaint history that surfaces real issues rather than vanishes them. Our composite score is the weighted average of those four — shipping, pricing, support, COA quality — and you can read the full rubric at /methodology.
For Peptide Sciences the audit is "public-data tier" — we aggregate vendor disclosures, third-party COA mirrors, operating-history evidence, and complaint patterns. A first-hand test order is still pending and the page will be upgraded when that lands.
Verdict
Shut down March 6, 2026 after 37 retatrutide samples failed Janoshik testing across 15 months. Do not order.
Other audited vendors
Sources
- Janoshik public-tests database — Janoshik Analytical
- Why Peptide Sciences shut down (March 2026) — The Peptide Catalog
- Peptide Sciences shutdown timeline + FDA pressure — PeptideLaws
- Every peptide vendor that shut down 2025-2026 — The Peptide Catalog
- Retatrutide identity fraud analysis — Kilo Biotechnology