Peptide Sciences Has Shut Down | QSC — The Verified Alternative

QSC · RESEARCH CATALOG

Peptide Sciences Has Shut Down — QSC Is the Verified Alternative
Complete PS Catalog · Independent Janoshik COA · Compounds PS Never Carried · US-Based

Peptide Sciences (peptidesciences.com) has permanently shut down operations, confirming the discontinuation of all product sales. For the estimated 35,000-40,000 monthly customers who relied on PS, finding a verified alternative is urgent. QSC (qscpeptide.com) is the most direct replacement: identical compound range, US-based, same-day shipping — with one critical upgrade: Janoshik independent COA (publicly verifiable at verify.janoshik.com), which PS never offered.

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Peptide Sciences Shutdown: What Happened

  • Peptide Sciences announced voluntary shutdown of all operations
  • Website (peptidesciences.com) now shows shutdown notice — all sales discontinued
  • Estimated 35,000-40,000 monthly orders were being processed at peak
  • Revenue estimated at $7M+ monthly at peak (SimilarWeb data, Dec 2025)
  • Timing coincides with FDA enforcement escalation against research peptide suppliers (2024-2025)

QSC vs Peptide Sciences: Side-by-Side

Feature QSC Peptide Sciences
COA Standard Janoshik independent (verify.janoshik.com) Internal only — unverifiable
COA Verifiable by Researcher? Yes — any researcher, any batch, publicly No — trust the supplier only
Full PS Catalog? Yes — every PS compound stocked N/A (shutdown)
Novel Compounds Retatrutide, Eloralintide, FOXO4-DRI, MOTS-c, SS-31, Cagrilintide Never stocked these
Bioregulators 20+ Khavinson catalog Limited (Epitalon only)
HPLC Purity ≥99% Stated ≥99% (internal testing)
US-Based Yes Was US-based (Henderson NV)
Currently Operating? Yes — in stock, shipping now No — permanently shut down

What QSC Has That PS Never Stocked

PS’s catalog gap was actually significant. These high-demand compounds are available at QSC and were never available at PS:

  • Retatrutide — Triple GLP-1R/GIPR/GCGR agonist, Phase 2 −24.2% weight loss
  • Eloralintide — Dual GLP-1R/GCGR, NASH trials (MEDI0382)
  • FOXO4-DRI — Senolytic, senescent cell apoptosis (Nature 2017)
  • MOTS-c — Mitochondria-derived AMPK activator, exercise adaptation
  • SS-31 (Elamipretide) — Inner mitochondrial membrane cardiolipin-targeted peptide
  • Cagrilintide — AMY1R amylin agonist, part of CagriSema Phase 3
  • Full Khavinson bioregulator catalog — 20+ tissue-specific epigenetic peptides

Frequently Asked Questions

Did Peptide Sciences shut down?
Yes — permanently. Their website confirms discontinuation of all sales. QSC stocks the complete PS catalog plus compounds PS never carried. ≥99% HPLC, Janoshik independent COA.
What is the best Peptide Sciences replacement?
QSC (qscpeptide.com) — identical compound range, US-based, plus Janoshik independent COA (verify.janoshik.com) and 30+ compounds PS never carried.
Does QSC stock everything PS sold?
Yes — all PS compounds plus Retatrutide, FOXO4-DRI, MOTS-c, SS-31, Cagrilintide, and full Khavinson catalog.
Was Peptide Sciences legit before it shut down?
PS operated for 10+ years as a legitimate US research supplier. Their limitation was internal-only COA testing. QSC improves on PS with Janoshik independent COA (publicly verifiable by researchers) and a wider catalog.

Switch to QSC — The Verified PS Alternative

Complete PS Catalog + More · ≥99% HPLC · Janoshik COA · verify.janoshik.com

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Research Use Only: All QSC products sold strictly for in vitro laboratory research. Not for human or veterinary use.
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