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 What is peptide purity? What is your recommended peptide purity for in vivo application? Can you also tell me how do you generally purify your peptides so that I know what kind of impurities I am expecting? How to read my peptide QC report? Especially the HPLC and MS report? What is the advantage of capping the N and C terminal of the peptide?