A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend 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: GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? Best Peptide Therapy Berkeley, CA Nubo Spa GHK Cu Glow Peptide Stack for Skin Rejuvenation Jennifer R. Berman MD