The U.S. Food and Drug Administration is moving toward allowing compounding pharmacies to produce more than a dozen injectable peptides that were banned because of potentially significant safety risks, the New York Neurogan Health Copper Peptide GHK CU , 120 mcg, 60 Tablets, 0.52 oz (15 g) eBay Copper, Collagen, and Controversy: Inside the GHK Cu Buzz What are GHK cu (Glycyl Histidyl Lysine Copper) injections?