PeptideSciences.com Has Shut Down: Best Verified Alternatives for Researchers
PeptideSciences Closed • Verified Alternatives • Same Compounds, Superior COA
PeptideSciences.com Has Shut Down: The Best Verified Alternatives for Researchers
PeptideSciences.com is permanently closed. This guide covers the most important criteria for choosing a replacement supplier — and why QSC is the closest like-for-like alternative for researchers who relied on PeptideSciences.
Research Use Disclaimer: All QSC products are sold strictly for in vitro laboratory research purposes only. Not approved for human or veterinary use. Researchers are responsible for compliance with local regulations in their jurisdiction.
PeptideSciences.com Is Permanently Closed
PeptideSciences.com has shut down and is no longer accepting orders. For the significant research community that relied on PeptideSciences as a primary source — known for consistent quality, a broad compound range, and US-based operations — finding a direct replacement is a priority.
The good news: QSC (Qingdao Sigma Chemical) has been supplying research peptides internationally for years and stocks every major compound previously available from PeptideSciences, with a broader catalog and independently verifiable Janoshik COA documentation that goes further than PeptideSciences’ testing model.
What to Look For in a PeptideSciences Replacement
Not all peptide suppliers are equivalent. When evaluating a PeptideSciences replacement, prioritise these criteria:
Independent COA verification
Third-party testing where you can independently confirm purity using the lab’s own database — not just a PDF the vendor provides.
≥99% HPLC purity
Research-grade standard with mass spectrometry identity confirmation on every batch — not just selective testing.
Domestic shipping
Warehouse in your region for no customs clearance and reliable delivery windows — replicating what PeptideSciences offered US customers.
Broad compound catalog
Enough range to source the majority of your compounds from one supplier — reducing vendor complexity and ensuring consistent quality standards.
✅ Full range including triple agonists and mitochondrial peptides
PeptideSciences Compounds Now Available at QSC
Every major compound previously available from PeptideSciences is in stock at QSC. Below are the most searched former PeptideSciences products and their QSC equivalents:
PeptideSciences provided COA documentation, but researchers had no independent way to verify that the documents reflected actual lab results — the data was controlled and provided solely by PeptideSciences.
QSC uses Janoshik Analytical — an independent third-party lab with a public verification database. Every QSC batch receives a unique Janoshik sample reference ID. Any researcher anywhere can enter that ID on janoshik.com and see the original unmodified lab results — without QSC’s involvement at any point.
Switch from PeptideSciences to QSC
200+ Compounds. Janoshik COA. Domestic Shipping from USA, EU, UK, CA & AU.
Everything PeptideSciences stocked — plus 60+ additional compounds including Retatrutide, SS-31, MOTS-c, and the full looksmaxxing stack. ≥99% HPLC purity verified independently on every batch.
Yes. PeptideSciences.com has permanently closed and is no longer accepting orders. Researchers who previously sourced from PeptideSciences need to identify a replacement supplier with equivalent or superior quality standards and product range.
What is the best PeptideSciences alternative?
QSC (qscpeptide.com) is the most direct like-for-like alternative. QSC offers a broader product catalog (200+ vs ~138 compounds), independently verifiable Janoshik COA documentation, and domestic shipping from warehouses in USA, EU, UK, Canada, and Australia. QSC purity standard is ≥99% HPLC verified with mass spectrometry identity confirmation on every batch.
Does QSC have the same peptides as PeptideSciences?
Yes. QSC stocks all major peptides previously available from PeptideSciences including BPC-157, TB-500, CJC-1295, Ipamorelin, HGH Fragment 176-191, Sermorelin, Tesamorelin, SS-31, MOTS-c, Epitalon, Thymosin Alpha-1, GHK-Cu, AOD-9604, Semax, Selank, PT-141, IGF-1 LR3, and 180+ additional research compounds.
How does QSC purity compare to PeptideSciences?
QSC products are verified at ≥99% purity by HPLC with mass spectrometry identity confirmation via independent Janoshik Analytical testing. COA results are publicly queryable on janoshik.com using the batch ID provided with every order — giving researchers independent verification that was not available with PeptideSciences’ documentation model.
Does QSC ship to the USA like PeptideSciences did?
Yes. QSC operates a domestic USA warehouse. Orders ship domestically without customs clearance, typically 2–5 business days. QSC also ships domestically from EU, UK, Canada, and Australia warehouses — covering five major research markets with no international customs delays.
