How to verify an MZ Biolabs COA
Check a certificate with the laboratory that issued it, not with the seller. These are the steps we use ourselves (check L3 in How we rate). Research use only.
- Certificates confirmed
- 55
Certificates confirmed
- Vendors confirmed
- 5
Vendors confirmed
Four steps
Find the code on the certificate
Each certificate carries a certificate ID that includes the product, size, lot and date.
Open the laboratory's own lookup
Open the certificate viewer on mzbiolabs.com with that ID (the link or code on the certificate leads there). Type the address yourself rather than following a link from the seller, and make sure the page is on the laboratory's own domain.
Compare the result with the vendor's copy
A real ID returns the certificate with its lot number. The product, lot, client name, test date, purity and quantity should all match; any difference in these is a material difference.
Run the control check
An invented ID returns a message that no certificate was found. Change one character of a real code and look it up again: a lookup that answers every code proves nothing.
mzbiolabs.com → (opens in new tab)
Our check (L3, pass): On 2026-10-22 the certificate viewer returned lot 3140013 for a real ID and 'No certificate ... was found' for an invented one.
What a confirmation is worth in our scores
On an MZ Biolabs certificate, a printed key earns +1.5 and a key we confirm at the laboratory earns another +1.5 under our lab rule. Only confirmed certificates count toward the testing gate (rule A9). We have confirmed 55 of 80 certificates naming MZ Biolabs, from 5 vendors; the vendors are listed on the MZ Biolabs profile. For what every field on a certificate means, read how to read a peptide COA.
Verifying MZ Biolabs: Frequently Asked Questions
Can I verify an MZ Biolabs COA online?
Yes. Each certificate carries a certificate ID that includes the product, size, lot and date. Open the certificate viewer on mzbiolabs.com with that ID (the link or code on the certificate leads there). A real ID returns the certificate with its lot number.
What should an invented MZ Biolabs code return?
An invented ID returns a message that no certificate was found. We ran this control when we checked the lookup on 2026-10-22.
How many MZ Biolabs certificates has Peptide Source Review confirmed?
55 of the 80 certificates naming MZ Biolabs on listed vendors' pages were confirmed against the laboratory's own record, from 5 vendors.
What tier is MZ Biolabs?
MZ Biolabs is tier A in our lab directory, graded on six published checks. Check L3 is whether its reports can be confirmed with the laboratory.