GHK Cu, commonly known as copper peptides, are found naturally within the human body where they play a vital role in skin repair and maintenance. Copper peptides support optimal skin function by helping GHK CU GHKCu (glycyl L histidyl L lysine copper) is a naturally occurring copper peptide found in the human body, particularly in plasma, saliva, and urine. It plays a key role in skin regeneration by promoting GHK Cu: The Regenerative Peptide for Skin, Hair, and Healing Pulse & Remedy Caregen Expands U.S. Retail Presence Through Partnership with 2San Caregen has partnered with U.S. healthcare distribution company 2San to expand its peptide based wellness products across the U.S. consumer retail market. Beginning