Purity is the most quoted number in the research peptide market, and the least understood. Here is what it actually means.
Purity vs amount
Purity is the percentage of the sample that is the target peptide. Amount is the total peptide mass in the vial. A vial can have the right amount and the wrong purity, or vice versa. Both matter, and both should appear on a proper certificate.
What does 99%+ mean?
Research grade peptides are sold to a 99%+ purity standard. That means at least 99% of the measured content is the target peptide, with under 1% impurities. Higher purity means fewer unknown compounds in the sample, which matters for reproducible research.
How purity is measured
Purity is usually measured by HPLC, high performance liquid chromatography, which separates the sample into its components. The area under the main peak relative to all peaks gives the purity percentage.
Purity tested vs content verified
Some certificates report purity, others report only identity and content. Both are useful, but they answer different questions. Purity tells you how clean the sample is. Content tells you how much peptide is present. We publish the certificate for every batch and state what the report actually covers.
The guarantee
If an independent laboratory reports purity below 99% on a tested batch, we refund the product in full. That is the standard we sell to.
For research and laboratory use only.