Research peptides with third-party COA documentation are the baseline a laboratory should expect from any supplier, and the certificate is only useful if it belongs to the lot in your hand. This page explains what a third-party certificate of analysis covers, how to check it against a vial, and where ours are published. Biotech Compounds supplies synthetic peptides for laboratory research use only.
Lot-level certificates for the peptides we list: /coas
What "third-party COA" means
A certificate of analysis is a report of the tests run on one production lot. "Third-party" means an independent laboratory, not the manufacturer, ran the tests. A supplier's in-house number is a claim; an independent result is evidence. Both can appear on the same certificate, and the document should say which is which.
What the certificate should show
- Lot or batch number that matches the vial label exactly.
- HPLC purity as a percentage, with the method noted (column, gradient, detection wavelength).
- Mass spectrometry identity: observed mass against the theoretical mass of the sequence.
- Appearance (for example, white lyophilized powder) and the stated net content.
- Test date and the testing laboratory, so the result can be traced.
Purity and net content are different numbers. A vial can test at 99% purity and still hold less material than the label states, so a complete certificate reports both. Our longer explainer on methods is peptide testing: methods, purity and COA results.
How to match a COA to a vial
- Read the lot number from the vial label before opening the shipping box insert.
- Open the supplier's certificate library and find that lot. A certificate with no lot number does not apply to your vial.
- Confirm the product name, net content and theoretical mass agree with the catalog listing.
- Keep the certificate with your laboratory's receiving records for the life of the vial.
Questions worth asking a supplier
Is a certificate published for every lot before it ships? Which tests are independent, and which laboratory ran them? Can you supply the raw HPLC trace on request? Will the same lot be available for a repeat order? A supplier that answers these plainly is doing the documentation work; one that sends a generic certificate is not.
Where to go next
Certificates by lot: /coas. The catalog, with net content on each listing: /shop. Our buying guides for laboratories cover bulk and white-label supply, lyophilized vial sizes and BPC-157 documentation.
For Research Use Only. This product is intended for laboratory and scientific research purposes only. It is not a drug or dietary supplement and is not for human or veterinary consumption. Not intended to diagnose, treat, cure, or prevent any disease. The statements made on this website have not been evaluated by the US Food and Drug Administration.
