Katie Mullen breaks down how to read a peptide Certificate of Analysis when choosing a supplier. Check five things: recent test date, correct peptide name, vial quantity matches your order, purity above 98%, and safety results for endotoxins and heavy metals. Many vendors skip heavy-metal testing, so verify it's there.
Every vendor should have a certificate of analysis exposed for every peptide that they have listed on their site. So this is the testing that they do to make sure it is what it says it is, there's as much in the vial as they say, and the toxin testing is clear. You're going to first want to look at the date, make sure it's like semi-recent. So this one's from Perfect Peptides, and you can see it's literally like a couple of weeks old, which is great. So if they're like 2, 3 years old, year old, that's pushing it. So I like that they're recent. And then here you can see it is retatrutide. The quantity— so this is how much is in the vial. I ordered 10 milligrams and there's 10 milligrams in it. So you want to make sure it's not overfilled or underfilled by too much because that'll mess up your dosing. The purity— anything over 98%. So this is 99% actual Retr in there. Here you can see it passes endotoxin testing, and also they test for heavy metals, which is nice to have. A lot of people don't do that. So heavy metal testing also passes. So those are the main things that I look for when I'm, you know, vetting a vendor. This is what I feel comfortable with. So hope this helps. These COAs are kind of hard to read sometimes, but am I missing anything? Anybody?
