Understanding Peptide Purity
What purity percentages mean, how they’re measured, and why threshold standards matter.
Peptide purity refers to the percentage of the target compound relative to all other detectable substances in a sample, as measured by HPLC. A purity of 99.0% means that 99.0% of the measured sample is the intended compound, with 1.0% consisting of impurities, degradation products, or other substances.
Apex Molecular Labs applies a ≥98% Verified Purity standard for all compounds. This standard is measured by reversed-phase HPLC at 214nm. Lots falling below this standard are rejected and not released to inventory.
Purity percentage alone does not confirm compound identity — that requires mass spectrometry confirmation. A complete COA includes both purity (HPLC) and identity (MS) data.
This content is provided for laboratory research purposes only and does not constitute medical, diagnostic, therapeutic, or veterinary guidance. All compounds are sold strictly for in vitro laboratory research use only.
