Where to buy research peptides
Not every supplier verifies what it sells. Before choosing where to buy research peptides, here's what to check — regardless of which catalog you end up ordering from.
A supplier should publish a COA for the specific batch you're buying, not a generic specification sheet reused across lots. If a COA isn't linked from the product page, ask for the batch-specific one before ordering.
Purity figures are only meaningful if an independent lab — not the supplier's own in-house process — ran the analysis. Look for the testing lab's name and method (RP-HPLC and mass spectrometry are the standard combination).
"99% pure" means little without knowing how it was measured. A supplier that explains its testing method (and links the guide behind it) is generally more reliable than one that only states a percentage.
Research peptides should ship as laboratory reference standards with an explicit research-use disclaimer, not marketed with dosing or human-use language. That framing is a signal the supplier understands the regulatory line it operates within.