AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan AHK Cu (Copper Peptide ): Hair Follicle Regeneration Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference So excited about this peptide! GHK Cu serum and scalp solution available Fascinating peptide that helps to prevent and reduce fine lines and wrinkles. Applied topically on the scalp for hair growth.