Coa and Lab Results
Why a Certificate of Analysis (COA) Matters for Peptides
A Certificate of Analysis (COA) is the key document that proves your peptide is what it claims to be. Issued by an independent lab, it confirms:
- The peptide’s identity (correct sequence and molecular weight)
- Purity level (ideally ≥98–99%)
- Absence of harmful contaminants
Without a valid, batch-matched COA, you risk using the wrong compound, impure material, or even dangerous contaminants—leading to unreliable results or wasted effort.
Understanding Lab Results
The main lab results on a COA tell you two simple things:
Is this the right peptide?
How pure/clean is it?
Here’s what to look for (in plain terms):
Purity
This shows how much of the powder is actually your peptide vs. junk or leftovers.
You want: 98% or higher (ideally 99%+).
Lower numbers mean more impurities that can mess things up.
Identity
This checks the exact weight of the molecules to confirm it’s the correct peptide.
The COA lists “Expected” weight and “Found” weight—they should be very close.
If they don’t match, it’s not what you ordered.
That’s basically it. A good COA has clear numbers for both, plus usually a simple graph showing one big clean peak for purity.
