GHK Copper Peptides for Skin and Hair Defy Medical Defy GHK Cu (glycyl L histidyl L lysine) is a naturally occurring copper binding peptide found in human plasma. As levels decline with age, so may its support of the biological processes involved in collagen production, skin GHK Cu Dosage Calculator Draw Volume In ML & U 100 Units GHK Cu Topical Spray Wells Pharmacy Network GHK Cu (Copper Peptide) AzulBotanicals