GHK Cu Capsules (2mg capsule, 30 capsules) Loti Labs GHK CU Copper Peptide, Face Serum, 1 oz (30 ml) Glow Blend Regeneration, Recovery & Skin Renewal 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 Defy GHK Cu (glycyl L histidyl L lysine) is a naturally occurring copper binding peptide found in human plasma. As levels decline with age, so may its support of the biological processes involved in collagen production, skin