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: Sublingual GHK Cu TruHealth Physical Therapy GHK Cu Copper Peptide Therapy Amazing GHK CU Copper Peptide For Youthful Skin And Hair GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link