GHK Cu Cooper Peptide: The Complete Skin & Repair Guide (2026) Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with There is tons of research on topical GHK Cu, but not much on the injections, even though that is what people are actually using. The benefits look promising, but the side effects and acne safety still GHK Cu Copper Peptide Neck & Face Serum