Peptide Sciences Has Closed
Peptide Sciences — one of the longest-running and most recognized names in the research peptide supplier space — shut down in March 2026. The closure was announced without extensive public explanation, and the site went offline shortly thereafter. For researchers who had relied on Peptide Sciences for years, the shutdown created an immediate need to identify a replacement supplier with comparable catalog depth, purity standards, and COA transparency.
This post covers what researchers need to know about the Peptide Sciences closure, what to look for in a replacement supplier, and how AminoForge’s catalog maps to what Peptide Sciences carried.
What Made Peptide Sciences a Trusted Supplier?
Peptide Sciences earned its reputation over years of operation through several consistent qualities that the research community valued: a broad catalog covering most major research peptide categories, HPLC purity documentation above 99%, third-party Certificate of Analysis availability, and a track record of consistent product quality. These are not unique capabilities — but they were executed reliably, which matters in a market where quality varies enormously between suppliers.
The standards that made Peptide Sciences trusted are the same standards any replacement supplier should be evaluated against:
- ≥99% HPLC-verified purity on all compounds
- Mass spectrometry identity confirmation
- Third-party Certificate of Analysis available before purchase
- Broad catalog covering GH axis, tissue repair, metabolic, longevity, and neuropeptide categories
- Clear RUO designation and compliant marketing practices
- Reliable fulfillment and domestic shipping
How AminoForge Compares
Purity and Quality Standards
AminoForge verifies every compound at ≥99% purity by HPLC with mass spectrometry identity confirmation. Every lot is independently tested, and COAs are available for download on our Certificate of Analysis page before you order — not just available on request. We believe COA transparency before purchase is a non-negotiable standard, not a premium feature.
USA Manufacturing
Most AminoForge compounds are USA manufactured — produced domestically with direct oversight of production standards and supply chain integrity. This matters for researchers who need to document compound provenance for institutional research protocols.
Catalog Coverage
AminoForge carries 40+ research compounds across all major research peptide categories. Below is a direct mapping of the most commonly researched Peptide Sciences compounds to the AminoForge catalog:
Tissue Repair & Regenerative: BPC-157, TB-500, GHK-Cu, Wolverine Blend, GLOW Blend
GH Axis: CJC-1295 No DAC, CJC-1295 With DAC, Ipamorelin, Sermorelin, Tesamorelin, IGF-1 LR3
Metabolic & GLP-1 Axis: Semaglutide, Tirzepatide, Retatrutide, Cagrilintide, AOD-9604, MOTS-C, 5-Amino-1MQ
Longevity & Senolytic: Epitalon, SS-31, FOXO4-DRI, NAD+, KLOW Blend
Immune & Thymic: Thymalin, Thymosin Alpha-1
Cognitive & Neuropeptides: Semax, Selank, Dihexa, Pinealon, DSIP
Melanocortin: PT-141, Melanotan 1, Melanotan 2
Reconstitution: Hospira Bacteriostatic Water
Evaluating Any New Supplier After Peptide Sciences
The Peptide Sciences closure is a reminder that supplier continuity in the research peptide space is not guaranteed. When evaluating any replacement supplier, the non-negotiables are:
- COA availability before purchase — not “available on request” but downloadable before you order
- Third-party testing — COAs from independent analytical labs, not self-issued
- HPLC + mass spec documentation — both purity and identity confirmed
- Clear RUO compliance — no human-use claims, appropriate legal framework
- Domestic fulfillment — faster shipping, fewer import complications, better supply chain oversight
For a detailed guide to evaluating research peptide supplier quality, see our How to Verify Peptide Purity guide. For a comprehensive comparison of current suppliers in the post-Peptide Sciences landscape, see our Best Peptide Vendors 2026 guide and our dedicated Peptide Sciences Alternative page.
AminoForge carries 40+ research compounds with ≥99% purity, pre-purchase COA access, USA manufacturing, and 48-hour shipping. Browse the full catalog →
All products sold by AminoForge are intended exclusively for laboratory and research purposes. Not for human or veterinary consumption. Researchers are responsible for compliance with all applicable laws and regulations governing research compound use in their jurisdiction.