About Peptide Sciences
Closed. Once the largest US gray-market research-peptide vendor (Henderson NV, 16-yr domain, ~$7.4M/mo), it voluntarily shut down 6 March 2026 with no refund process; it sold in-house-COA product and independent third-party testing (Janoshik via Finnrick) confirmed counterfeit/misidentified GLP-1 peptides.
Score overview
How we score →Weighted composite across 8 criteria; the letter grade follows our published bands and integrity gate.
Key facts
Pros
- 16-year US (Henderson NV) domain, HTTPS, huge catalog and fast US shipping while it operated
- High independent purity and A/B third-party ratings on classic peptides (BPC-157, Ipamorelin, PT-141, Semaglutide)
- Multiple payment rails (card, crypto, Zelle)
Cons
- Closed 6 March 2026 with no refund process and support gone dark; fraudulent copycats now impersonate the brand
- COAs were in-house only (no third-party lab named); independent Janoshik/Finnrick testing found ~15% identity failures and counterfeit retatrutide (exendin-4), rating retatrutide/CJC-1295/tesamorelin E and tirzepatide D
- Premium pricing, no refunds or returns, and a polarized low-volume review record
Is Peptide Sciences legit? Common questions
Is Peptide Sciences a legit peptide vendor?
We flagged Peptide Sciences for fabricated or reused testing evidence, so it sits at the bottom of our scale (F, 39.4/100). We would avoid it.
Does Peptide Sciences provide third-party lab testing?
Only in-house. Peptide Sciences shows in-house testing but no independent third-party COA, so we cannot verify purity claims and the grade is capped accordingly.
Where does Peptide Sciences ship to and how fast?
Peptide Sciences reports shipping to United States, typically in around 2-3 days (US).
What payment methods does Peptide Sciences accept?
Peptide Sciences accepts card, crypto, bank transfer.
When was this Peptide Sciences review last updated?
This grade was last reviewed on 2026-07-04 under methodology v1.0.
Closed as of 6 March 2026 and not recoverable – no refunds, and any site claiming to be its successor is fraudulent. Even historically it earns an F: in-house-only COAs plus independent third-party tests showing counterfeit/misidentified retatrutide (exendin-4 substitution), tirzepatide, CJC-1295 and tesamorelin.
Our labelled opinion, based on the dated evidence in the score overview. See how we score.
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Grades reflect vendor reliability only, not the safety, efficacy, or legality of any product. Nothing here is medical advice.