Testing standards
Our compounds are independently analysed by laboratories we do not own or pay to flatter us. Here's exactly what is tested, what each result proves, and how you can read it for yourself.
Purity, identity and safety — checked separately.
Each test answers a different question. Together they establish what the compound is, and how pure it is.
How pure is it?
Reverse-phase HPLC separates everything in the sample. Purity is the main peak as a percentage of all peaks — reported with the chromatogram, e.g. 99.9% pure.
What is it, exactly?
Mass spectrometry measures the molecular weight and compares it to the theoretical value for the sequence. A match confirms identity.
How to read a certificate.
A worked example. The numbered points explain each line of a certificate of analysis.
- 1
Compound & SKU
What the certificate is for. Should match the product you're viewing.
- 2
HPLC purity
A high percentage with a single dominant peak on the chromatogram.
- 3
Mass Spec identity
Confirms the pure peak is the correct compound.
- 4
Dates & lab
When it was analysed and released, and by whom.
Tested by labs that don't sell peptides.
A laboratory with no stake in the sale has no reason to flatter a result. That independence is the point.
Independent laboratory
Independent analysis — HPLC purity and LC-MS identity, issued as a certificate of analysis.
HPLC · LC-MSWhere our certificates come from
Most of our certificates are commissioned by a third party with no commercial interest in the result, and performed by laboratories in the United States. Two are from Janoshik, a European laboratory, and can be checked directly on the lab's own verification page.
HPLC · Mass SpecCertificates are published, not promised.
Look up any compound here to see whether a certificate is held, and open it — no account required.