GHK Cu (Copper Peptide): What the Data Actually Suggests GHK Cu is a naturally occurring tripeptide (glycyl L histidyl L lysine) bound to copper, identified in human plasma and known to decline with age. Current literature has explored GMP GHK CU 75mg PekCura Labs How long will a 50 mg supply of GHKCu last when dosing 2 mg daily for five consecutive days followed by two days off each week? Klow Peptide Dosage Chart TikTok