Check the paperwork before you trust the vial.
A certificate of analysis (COA) is the only evidence a research peptide supplier can show you. Most buyers glance at the purity number and stop. This site explains how to read the whole document, and what separates a real lot test from a PDF that just looks official.
Start here
- How to read a peptide COA, line by line: identity, purity, lot number, the lab, and the date.
- Peptide purity, explained: what the % on a COA measures, and what it leaves out.
- "Same batch" isn't proof: why a lot claim means something only when a random sample from that lot is tested.
- Ten questions to ask any supplier before you order.
Why this exists
My sister runs a research-use-only supply store built on one rule: a lot isn't sold until an independent lab has tested a random sample from it. Watching her turn a whole lot away taught me how much a COA can hide and how much it can prove. These guides are what I learned. They apply to any supplier, including hers.
Where I point people: TrueVial, my sister's store, publishes a lot-specific COA for every lot it sells.
Code JORDAN10 takes 10% off at truevial.co. It's an affiliate link: I earn a commission, and it costs you nothing extra.