G H K the beauty peptide everyone's talking about If you're serious about skin health from the inside out, GHK (glycyl L histidyl L lysine) is one to know. Naturally found in the body, GHK Cu (copper peptide) is a science backed anti aging compound that supports collagen production, skin regeneration, and overall skin health. Used in both topical serums and subcutaneous 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 Ghk cu Copper Peptide Serum Anti Aging & Firming Care