FDA Reverses Peptide Ban: BPC 157, GHK Cu Back! The FDA has restored BPC 157, GHK Cu, and 12 other crucial peptides to legal compounding status, effective 2026 under RFK Jr.'s HHS leadership. This means 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 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 Does GHK Cu Really Work? 40 Years of Research Reviewed