Peptide Sciences
USA · peptidesciences.com
- Third-party tested
- Yes
- COA publicly posted
- Yes
- Method
- HPLC + Mass Spec
- Avg purity reported
- 99
- Domestic
- Cold chain
- Credit Card
- Crypto
- Reddit sentiment
- historically very positive
- Finnrick tested
- Yes · Tier 1
What they carry
Peptide Sciences
STATUS: CLOSED — March 2026
Formerly one of the largest US peptide vendors with estimated revenue of $7M+/month. Closed operations in March 2026.
Overview
Peptide Sciences was one of the largest and most well-known US research peptide vendors, with an estimated monthly revenue exceeding $7 million. They operated for years as a go-to source for the research community before shutting down in March 2026. Their closure sent shockwaves through the peptide community and marked a significant shift in the vendor landscape.
The closure is believed to be related to the FDA-crackdown-on-peptide-vendors-2025-2026 and the changing regulatory environment around research peptides, particularly Semaglutide and Tirzepatide following the end of FDA shortage designations.
Products & Testing
At their peak, they carried ~100+ research peptides covering nearly every category: healing (BPC-157, TB-500), GH secretagogues (CJC-1295, Ipamorelin), weight management (Semaglutide, Tirzepatide), sexual health (PT-141), and more. Third-party tested via HPLC + Mass Spec with publicly available COAs. Finnrick rated them Tier 1.
Shipping & Payment
No longer operational.
Community Reputation
Historically one of the most recommended vendors on Reddit and peptide forums. Finnrick Tier 1. Their closure was widely discussed and lamented in the community. Many customers scrambled to find replacement vendors, driving traffic to remaining active vendors like Apollo-Peptide-Sciences, Limitless-Life-Nootropics, and Amino-Club.
Regulatory Status
Closed March 2026. No public FDA warning letter, but the closure timing aligns with the broader FDA-crackdown-on-peptide-vendors-2025-2026. The company did not publicly disclose the specific reason for shutting down. Given their scale ($7M+/mo), the closure likely involved either regulatory pressure, legal counsel advice, or proactive risk management in the face of increasing FDA enforcement.
Compounds Available (Historical)
See Also
- FDA-Warning-Letters-April-2026
- Amino-Asylum
- Science-Bio
- Peptide-Sciences-Shutdown-March-2026