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: A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? GHK Cu Peptide: What It Does for Body Composition and Metabolic Health Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline