Anyone can print "99% pure" on a label. A COA is the third-party (or manufacturer) lab report that backs it up — or doesn't. Knowing how to read one separates people who get what they paid for from people who get scammed.
The two tests that matter
HPLC — purity
High-Performance Liquid Chromatography measures how much of the sample is the actual peptide versus impurities. You're looking for a single dominant peak and a purity figure — typically 98%+ for a good peptide. The chromatogram should show one tall, clean peak, not a forest of small ones.
Mass Spectrometry — identity
Mass spec confirms the peptide is what it claims to be by measuring its molecular weight. The reported mass should match the known molecular weight of the peptide (for example, Retatrutide's known mass). If the mass is off, you have the wrong molecule — purity doesn't matter if it's purely the wrong thing.
What to actually check
Our honesty on testing
Here's exactly where we stand: every batch we sell comes with the manufacturer's COA, which we'll share with you on request before you order. We're working toward independent third-party verification on every batch — when that's fully in place, we'll say so loudly and link the reports right here. We'd rather tell you the honest current state than slap a "lab-verified" badge on something we haven't earned yet.
Message us on WhatsApp and we'll send the current batch COA before you buy. If you ever want to send a sample to an independent lab yourself, we'll tell you exactly how — we have nothing to hide.