How to Read a Peptide Lab Report (COA)

What each line means

Line	What it tells you
Lab name	Who tested it. Look for an accredited lab (ISO/IEC 17025).
Client / sample	Should name the seller and the product.
Batch number	Must match the number printed on your vial.
Test date	Recent is better. A report more than about 6 months old may not describe the batch you have.
Purity (HPLC)	How much of the powder is the right peptide. 98% or higher is the usual bar.
Amount (quantity)	Milligrams actually in the vial. Within about 10% of the label is good.
Identity (mass spec)	Confirms it is the peptide on the label.
Endotoxin	Bacterial toxin level, in EU. Lower is better.
Sterility	Whether bacteria or fungi grew. Should say no growth.
Heavy metals	Lead, arsenic, mercury, cadmium. Should be low or not detected.

Find the report ID or verification code on the report.
Go to the lab’s own website yourself; do not trust a link only the seller gives you.
Enter the code and compare product, batch, date and numbers.
If the lab has no record, treat the report as fake.