Copper Peptide Serum for Hair Regrowth & Thinning Hair Feline Skinscience Absolute GHK cu Stem Cells & Peptide Hair Growth Serum and Shampoo MTS Set He didn't expect THIS Hair thinning. Clumps in the shower. Confidence taking a hit Then he tried something most people have NEVER heard of GHK Cu (Copper Peptide) Look at 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.