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