GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Cu Copper Peptide 0.5% (topical foam) The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule