This page compares QSC and Peptide Sciences as research compound suppliers for Cardarine (GW501516). Both suppliers offer Cardarine for research use. Key differentiators are purity verification methodology, batch documentation, shipping coverage, and catalog depth.
Side-by-Side Comparison
Factor
QSC
Peptide Sciences
Purity verification
QSC: Janoshik third-party independent COA — every batch
Peptide Sciences: typically in-house or unspecified third party
HPLC standard
QSC: ≥99% HPLC confirmed
Peptide Sciences: purity claim varies by batch
MS identity verification
QSC: Every batch — molecular identity confirmed by mass spectrometry
Peptide Sciences: not always documented per batch
Shipping regions
QSC: USA · EU · UK · Canada · Australia — domestic fulfilment in each
Peptide Sciences: narrower catalog in most categories
Compound availability
QSC: Cardarine available in multiple dose configurations
Peptide Sciences: availability and dosing may differ
Why Researchers Choose QSC for Cardarine
The Janoshik COA is QSC’s primary differentiator. Janoshik Analytical is an independent Czech Republic testing laboratory that publishes results publicly. Every QSC batch is submitted externally — researchers can verify the COA is genuine and view results from the same independent lab. This is a higher standard than in-house QC.
QSC also stocks 99 compounds — the broadest research catalog available, covering peptides, SARMs, GLP-1 agonists, longevity compounds, oral steroids, and novel compounds like survodutide, mazdutide, and orforglipron that most competitors do not carry.
