Uses and Benefits #ghk GHK Cu is a naturally occurring peptide in human plasma that declines with age. When used in injections (usually subcutaneous), it can offer various benefits: Skin Rejuvenation and Anti Aging: PDF) The effect of tripeptide copper complex on human hair growth in vitro GHK CU Copper Peptide, Face Serum, 1 oz (30 ml) GHK Cu Copper Peptide Collagen, Skin Rejuvenation & Hair Restoration GHK Cu Peptide in Austin Saving Face GHK Peptide Hair Growth Clinical Trial (2016) Research Summary Hairgenetix