How do I verify a certificate of analysis for a research peptide?

Enter the lot number printed on the vial label into the lookup on this page. The full panel loads — purity by HPLC, identity by mass spectrometry, endotoxin, heavy metals and water content — with the testing laboratory named. No account and no email address are required to read it.

Where is the lot number on the vial?

On the vial label and repeated on the packing slip in the box. It identifies one fill run, so every vial filled at the same time shares it and shares one certificate.

What if a lot number does not resolve?

Then we are not selling that lot. Every lot is published here before it is listed for sale, so a lot number that returns nothing did not come from us, or has not been published yet. Contact team@rensaresearch.com with the number and we will tell you which.

Do certificates stay online after a lot sells out?

Yes. Certificates are never taken down. A lot number from an order placed a year ago resolves exactly as it did on the day it shipped.

Public certificate lookup

Verify a lot

Enter the lot number printed on the vial label to read the full certificate of analysis — the same document we hold, with the testing laboratory named. 10 lots are online right now. No account, no email, no gate: if a lot number doesn't resolve here, we are not selling that lot.

Certificate lookup

Printed on every vial label. No account needed.

Where the number is

Printed on the vial label under the compound name, and repeated on the packing slip inside every box.

What gets tested

HPLC purity, reported for the lot rather than against a blanket specification, plus mass-spec identity, LAL endotoxin, ICP-MS heavy metals, Karl Fischer water content, and appearance.

Certificates don't disappear

A lot's certificate stays online after that lot sells out. We never take one down, including for lots we later pull.

A number that won't resolve

Check O against 0 and the digits after the dash — our lots read RR-SKU-YYMM-NNN. If it still fails, email a photo of the label to team@rensaresearch.com and we'll trace it. If it came from another supplier, we can tell you whether that lot format is one an independent lab would have issued — but we can only certify our own material.

How we test →

About lot verification

How do I verify a certificate of analysis for a research peptide?: Enter the lot number printed on the vial label into the lookup on this page. The full panel loads — purity by HPLC, identity by mass spectrometry, endotoxin, heavy metals and water content — with the testing laboratory named. No account and no email address are required to read it.
Where is the lot number on the vial?: On the vial label and repeated on the packing slip in the box. It identifies one fill run, so every vial filled at the same time shares it and shares one certificate.
What if a lot number does not resolve?: Then we are not selling that lot. Every lot is published here before it is listed for sale, so a lot number that returns nothing did not come from us, or has not been published yet. Contact team@rensaresearch.com with the number and we will tell you which.
Do certificates stay online after a lot sells out?: Yes. Certificates are never taken down. A lot number from an order placed a year ago resolves exactly as it did on the day it shipped.

Browse every published batch at certificates of analysis, or read how to read a certificate of analysis.