How to test what you bought.
A seller's COA can lie. An outside test cannot. A mass spec test runs about $80 and takes a couple of weeks.
1
Your vial
Send a tiny bit of the powder to a lab.
2
An outside lab
They run mass spec to weigh the molecule.
3
The answer
Does the weight match what you ordered?
A seller’s own report can lie. An outside test cannot. About $80, results in about two weeks.
A () tells you what the seller says is in the vial. An outside tells you what is really in there. They are not the same. The space between them is where most people get hurt.
Why the seller's COA is not enough
The seller pays the lab. Some labs are honest. Some reuse old results. Some are just made up. A real-looking PDF proves nothing about the powder in your vial. Posted test results from chat groups tell a clear story. About 10 to 25% of US "research only" sellers fail an outside test on at least one peptide they sell. Wrong molecule, wrong amount, or hidden junk. We do not name sellers, but the pattern is real.
What an outside ID test checks
It runs your sample through a machine called a mass spec (short for ). The mass spec weighs the molecule. If the weight matches the you ordered, it is the right molecule. The weight of a molecule is a hard fact, so this test is hard to fake. Many labs also run , a test for how pure it is. If the mass spec weight does not match, you have the wrong stuff. That is the big failure to watch for.
When to test:
- your first order from a new seller
- a vial that looks off (wrong color, wrong texture, a broken seal)
- a price that is oddly low
- a new batch from a seller you trusted before (batches can change)
Where to send a sample
Unlike sellers, we DO name the labs, because they are independent and it helps you. The most-trusted ones are Janoshik (the community gold standard), MZ Biolabs, Vanguard Laboratory, Bioviridian, and Freedom Diagnostics. Chromate tests single samples too, though its results have been more mixed. One more: Finnrick is handy, but it is a ratings site that gathers test results, not a lab you mail your sample to. Lab names rise and fall over time, so check the current chat-group talk before you pick one. Plan on about $60 to $120 per , with results in 1 to 3 weeks. You usually mail a tiny bit of the dry powder, about 5 to 10 mg.
How to read the result. The lab sends back a PDF. Look for:
- a mass spec weight that matches the you ordered (the most important line; if this fails, the molecule is wrong, full stop)
- purity of 95% or higher (98% or more is pharmacy-grade)
- an level under 0.5 EU/mg, if they list it ( is dead-germ bits that can make you sick)
- no surprise spikes on the chart
If anything looks wrong, post the result back to the group where you found the lab. That feedback is how sellers earn or lose trust.
Is it worth it?
Paying $80 to test a $40 vial sounds like a lot. But one vial holds many doses, so the cost spreads thin. And it beats putting an unknown thing into your body. Test new sellers. Trust the ones you checked. Test again now and then to make sure the batch still holds.
More: How to read a COA · How to source · The four sourcing tiers.
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