GHK Cu Copper Peptide Hair & Scalp Serum Does it work? Maneup GHK Cu hair growth serum : r tressless 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 GHK Cu Dosage for Hair Growth and Skin Rejuvenation GHK Cu Peptide for Hair Growth: Science, Benefits, and How It Works I reversed my thinning hair naturally with diet and supplements