What a COA tells you
- Identity: By mass spectrometry (MS) – is the right substance in there at all?
- Purity: By HPLC – what percentage is the intended substance, how much is by-products?
- Content: Is there really 10 mg in the vial – or 7, or 14?
What is almost always missing: tests for microbes (sterility) and endotoxins. Those are exactly what matter for injections.
How to spot a bad COA
- No lab name, or a lab that can’t be checked
- Batch number on the certificate doesn’t match the vial
- Only one certificate for “all” batches, or a very old date
- No way to verify the certificate with the lab
- 100.0 % purity – that is practically impossible
Some users have samples tested by independent labs themselves. That shows the identity and content of one sample – it says little about other vials from the same delivery.
Warning signs on the vial
- Solution stays cloudy or has flakes, strands or particles
- Discolouration (yellowish, brownish) where it should be colourless
- Powder has melted, sticks as a film to the glass wall or is almost missing
- Damaged stopper or loose cap
Foam often comes simply from shaking – so let the liquid run slowly down the glass wall and only swirl gently. If the solution stays cloudy afterwards: do not use it. And if an amount that worked before suddenly has no effect at all, your body is not the problem – most likely the product is.
When to see a doctor
- Fever, chills or severe redness after an injection
- Unusually strong side effects after starting a new vial
- Allergic reactions: rash, facial swelling, shortness of breath – call 112
In an emergency: call 112.
FAQ
Can I still use a cloudy peptide?
No. If the solution stays cloudy after gentle swirling or has flakes, that can point to contamination or degradation.
What does COA mean for peptides?
Certificate of Analysis – a lab report on the identity, purity and content of a batch. Only meaningful if it is independent, batch-specific and verifiable.
Why isn’t my peptide working?
Common reasons are calculation errors when reconstituting, incorrect storage or simply a defective product. With products that are not approved, nobody can guarantee the content.
This article does not replace medical advice. It does not give any dosing recommendations. As of September 2026.