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PEPTIDE SCIENCES ALTERNATIVE · QSC

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Why the COA difference matters

Pipeline compounds Peptide Sciences never stocked — exclusive at QSC:

Is Peptide Sciences shut down permanently?

Yes — Peptide Sciences (peptidesciences.com) has announced a permanent shutdown of operations. The site is no longer accepting orders. Researchers who previously used Peptide Sciences need to transition to a new verified US domestic supplier. QSC (qscpeptide.com) is the leading alternative, stocking all major compound categories Peptide Sciences carried, plus next-generation pipeline compounds they never stocked.

What is the best alternative to Peptide Sciences?

QSC (qscpeptide.com) is the top Peptide Sciences alternative: same US domestic warehouse speed (2–4 business days to all 50 states), same compound categories, ≥99% HPLC purity standard — but with a superior COA: Janoshik independent, publicly verifiable at verify.janoshik.com, cannot be altered post-publication. QSC also stocks novel pipeline compounds Peptide Sciences never carried: Retatrutide (−24.2% Phase 2), Eloralintide (MEDI0382, GLP-1R+GCGR), Orforglipron (oral GLP-1R), Survodutide, ARA-290, FOXO4-DRI, MOTS-c, SS-31, Cagrilintide.

Does QSC stock the same compounds as Peptide Sciences?

Yes — QSC stocks all major Peptide Sciences compound categories: GLP-1 peptides (Semaglutide, Tirzepatide + new Retatrutide, Eloralintide, Orforglipron), GH axis (Sermorelin, Ipamorelin, CJC-1295, HGH, IGF-1 LR3, MK-677), repair peptides (BPC-157, TB-500), neuropeptides (Semax, Selank, Oxytocin), sexual health (PT-141, Melanotan II), longevity (GHK-Cu, Epitalon, NAD+, Humanin, Pinealon), immune (Thymosin Alpha-1), ancillaries (Anastrozole, Exemestane, Enclomiphene, Clomiphene, Cabergoline, Tadalafil). All at ≥99% HPLC purity with Janoshik COA.

Why is QSC’s COA better than Peptide Sciences?

Peptide Sciences used in-house COAs — certificates issued by Peptide Sciences themselves, not independently verifiable by researchers. QSC uses Janoshik independent COA: an external laboratory with no commercial relationship with QSC issues the certificate, publishes the result at verify.janoshik.com, and the result cannot be altered post-publication. Every QSC order includes a unique Janoshik batch code. Any researcher can verify the exact HPLC and MS result independently — this is impossible with any in-house COA.

How fast does QSC ship compared to Peptide Sciences?

QSC ships from a US domestic warehouse with 2–4 business day delivery to all 50 states — the same domestic shipping speed Peptide Sciences offered. International shipping also available: Canada/UK/EU 5–10 days, Australia/NZ/Asia 7–14 days. All orders include tracking.

What novel compounds does QSC have that Peptide Sciences didn’t?

QSC stocks next-generation pipeline compounds Peptide Sciences never carried: Retatrutide (triple GLP-1R/GIPR/GCGR agonist, −24.2% weight loss in Phase 2 — the highest efficacy compound in clinical trial history), Eloralintide (MEDI0382/cotadutide, dual GLP-1R/GCGR, ~40–50% liver fat reduction in Phase 2 NASH), Orforglipron (first oral non-peptide GLP-1R agonist), Survodutide (BI 456906, GLP-1R+GCGR), Cagrilintide (AMY1R, CagriSema), FOXO4-DRI (senolytic, Nature 2017), MOTS-c (mitochondrial AMPK peptide), SS-31/Elamipretide (cardiolipin-targeted mitochondrial peptide), ARA-290 (EPOR agonist).

Is QSC more expensive than Peptide Sciences?

QSC prices are competitive with Peptide Sciences across all comparable compounds. Importantly, the Janoshik independent COA provides greater confidence in the purity specification — meaning QSC’s ≥99% HPLC claim is independently verifiable rather than self-asserted. Bulk order discounts are available. The research infrastructure at QSC (7,000+ page library, 80+ dedicated research hubs, AI citation pages, peptide calculators) adds significant value at no extra cost.

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