Safety & Sourcing
How do I know if a vendor is legit? What's a real Certificate of Analysis?
Updated 2026-05-02
A real Certificate of Analysis (CoA) is a report from an independent third-party lab - not the vendor's own lab - that tells you exactly what's in the specific batch of your specific vial. If you can't match the lot number on the CoA to the lot number printed on your vial, it's not your batch's CoA. Three tests matter for injection: HPLC for purity, mass spectrometry for identity, and an endotoxin test for safety.
IfIf the CoA lot number doesn't match your vial's lot number
Thenthen ask for the correct one or don't buy
IfIf the vendor can't produce a CoA at all
Thenthen don't purchase for injection
IfIf the CoA shows purity but no endotoxin test
Thenthen ask for the endotoxin result before injecting
IfIf you're sourcing from a licensed 503A pharmacy
Thenthen verify their state pharmacy board license - they are required to meet USP 797
Key facts
- A real CoA must include: independent third-party laboratory name and accreditation, lot or batch number that matches your vial, HPLC purity percentage (target above 98%), mass spectrometry confirmation of molecular weight, endotoxin test result in EU/mg, and a beyond-use date
- Red flag: 99% pure claim with no lot number
- Red flag: CoA has no independent lab name
- Red flag: vendor sends a generic CoA that is the same for every batch
- Red flag: no endotoxin result
Get more like this
Your guided peptide companion.
PRTCL walks beginners through their first peptide with confidence - guided reconstitution, dose calculation, vial tracking, and answers to questions like this one. Built for first-timers, useful for everyone.
- · Guided walkthrough for your first dose
- · Dose calculator that does the math for you
- · Vial inventory and dose log tracking
- · Library of physician-vetted protocols
Free to start. Sign in if you already have an account.
PRTCL is educational. Always talk to a licensed provider about your situation.
%20-%20white.png)