GHK Cu (copper peptide) is one of the most talked about wellness peptidesand for good reason This naturally occurring peptide has been studied for its potential to support skin quality, hair health, and Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with 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: Absence of evidence isnt evidence of absence its a popular argument, but its not how we should be guiding treatment decisions. In this short, I respond to a comment about GHK Cu injections for GHK Cu 50mg vs 100mg: Which Concentration Should You Buy?