Could you please tell me the % purity that "crude" represents? September 25, 2019 13:01 Updated We do not guarantee purity of crude peptide. HPLC report will indicate the actual purity, and it can vary in a wide range. Related articles Can you also tell me how do you generally purify your peptides so that I know what kind of impurities I am expecting? What is peptide purity? What quality control data is provided by GenScript?