GHK Cu Hair Growth Spray Strengthen & Revitalize Hair Pure Tides Therapy 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care Your skincare isn't working. But your hair is the real signal. If you're noticing thinning, shedding, or less density it's not random. And it's not just genetics. Meet GHK Cu (copper peptide): 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.