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: Wellness peptide craze: why people are injecting drugs 'not for human consumption' GHK CU Peptide for Skin Rejuvenation Wittmer Rejuvenation Clinic Improve Aging and More with GHK Cu Core Medical Group Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms