Reading a lab report (the COA)
The four tests that matter, what a real report looks like, and what the numbers don't tell you.
A certificate of analysis, or COA, is a lab report for one batch of one peptide. If a vendor can't show you one, they didn't test the batch. If they show you one that doesn't say what you think it says, that's more common, and this lesson is about telling the difference. Ten minutes here saves more money than anything else in the course.
The four tests that matter
- Purity. A machine called HPLC separates the powder into everything that's in it and reports what fraction is the peptide you wanted. Think of it as "how much of this is the real thing." 98% or higher is normal for a good batch. Below about 95%, you're paying for junk, usually broken or misshapen copies of the peptide that do nothing.
- Identity. Purity tells you how pure something is. It doesn't tell you what it is. A second test, mass spectrometry, checks that the molecule weighs what the real peptide should weigh. A purity number with no identity test is a purity number for a mystery powder.
- Endotoxin. Leftover bacterial residue from manufacturing. It matters because injecting it causes fever and inflammation. Anything meant for injection should show a low endotoxin result. A report that skips this test skipped the one that matters most for safety.
- Sterility, if they claim it. A sterile-filled vial gets tested for germs. Most research-chemical vendors don't claim sterility at all, which is worth knowing before you assume it.
What a real report looks like
- It names the lab, and the lab is real. A few independent labs have tested peptides for the community for years and have their own report format. Some let you type in the report number on their website to confirm it. A report with no lab name was made by the vendor.
- It names the batch, and that batch matches the vial in your hand. A report for a different batch is a report for a different product.
- It shows the graph, not just a number. The purity test produces a chart with peaks. A report that's only a typed "99.2%" with no chart is just a typed number.
- It's dated. Peptides break down over time. A report from two years ago tells you what the batch was, not what it is now.
What the numbers don't tell you
Purity is a percentage of what's in the vial. It is not how much is in the vial. A vial that is 99% pure and labeled 5 mg can contain 3 mg. The test for that, called net peptide content, is one almost nobody runs. The report also doesn't tell you how the vial was stored between the lab and your door, which is why module two starts with what to do when a package arrives.