Comparing QSC and Peptide Sciences for Vardenafil (Levitra) research compound supply. Key differences: purity verification, COA documentation, shipping, and catalog depth.
Factor
QSC
Peptide Sciences
Purity verification
QSC: Janoshik third-party COA every batch
Peptide Sciences: in-house or unspecified
HPLC purity
QSC: ≥99% confirmed
Peptide Sciences: claim varies
MS identity
QSC: Every batch
Peptide Sciences: not always documented
Shipping
QSC: USA·EU·UK·Canada·Australia
Peptide Sciences: availability varies
Catalog
QSC: 99 compounds
Peptide Sciences: narrower range
QSC submits every batch to Janoshik Analytical — independent third-party verification, publicly verifiable, every batch.
