NL GHK Cu (TETRAPEPTIDE + CU) Synthagen Synthagen PL GHK Cu (Copper Peptide) has emerged as one of the most promising regenerative peptides for hair restoration due to its ability to stimulate follicular activity, improve scalp circulation, reduce inflammation, and prolong the Dimeric copper peptide incorporated hydrogel for promoting diabetic wound healing Nature Communications 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.