Copper peptides explained what are the differences between copper peptides and GHK CU peptides? What they actually do for the skin in terms of repair and collagen, and what you can and cant mix Glow from the inside out. GLOW Peptide Therapy is a powerful blend of BPC 157, TB 400, and GHK Cu designed to support collagen production, soften the appearance of fine lines, and improve skin Customer reviews for Skin Perfection GHK Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz Walmart.com Copper Peptide (GHK CU) 1% Serum