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26d • Peptide Tips
What is Conformity Testing? (And why it matters)
When a vendor tests a batch of peptides, they typically send ONE vial to the lab. That vial comes back with a COA showing purity and net content.
But here's the thing—that batch might be 100, 500, 1,000, or even 10,000+ vials all lyophilized at the same time.
One vial tested. Thousands shipped.
This is where conformity testing comes in.
Instead of testing a single vial and calling it a day, conformity testing means testing MULTIPLE vials from the same batch to verify consistency across the entire production run.
The gold standard I've seen across quality-focused vendors is 3 vials per batch. Three random samples, three separate analyses, three sets of results that should align closely.
"Why not just test every vial?"
I get this question a lot. Here's the reality: every vial tested gets destroyed in the process. Testing isn't like scanning a barcode—the vial gets opened, contents get analyzed, and that peptide is gone.
Test all 1,000 vials? You'd have 1,000 COAs and zero product left.
Conformity testing is the practical middle ground. It's not 1:1 verification (that's impossible), but testing 3 vials instead of 1 gives you significantly more confidence that what's on the COA actually represents what's in YOUR vial.
It's one more step that separates vendors who check the box from vendors who actually care about consistency.
Full breakdown with more detail here 👇
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What is Conformity Testing? (And why it matters)
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