Why sourcing is the real risk
The biggest danger with research peptides isn't the molecule — it's not getting the molecule you paid for. The grey market is full of underdosed, mislabeled, or contaminated vials.
A Certificate of Analysis (COA) is your single best defense. It shows what's actually in the vial and how pure it is.
What a trustworthy COA includes
- Identity confirmed by mass spectrometry (it's the right molecule)
- HPLC purity ≥ 98% — with the chromatogram image, not just a number
- Bacterial endotoxin below 1 EU/mg for anything injected
- A residual-solvent panel (TFA, acetonitrile, DMF)
- An ISO 17025 / A2LA-accredited third-party lab
- A batch number that matches your vial's label
Vendor green flags vs. red flags
Green: batch-specific COAs for the exact vial you receive, a named accredited lab, clear contact info, and a reship/refund policy.
Red: a single 'stock' COA reused across products, a purity number with no chromatogram, no endotoxin testing on injectables, or pricing that's too good to be true.
Use the tool
Rather than eyeball a COA, run its numbers through our Vial Confidence checker for an instant green/amber/red read and the exact questions to ask your supplier.