Research chemicals known as peptides, many of them banned by the World Anti Doping Agency and some not approved for human use in the United States, are available with the simple click of Peptide Research Overview Mechanisms, Applications & Insights GHK Cu Topical Cream Parents & teen athletes: not everything trending on social media is safe., Copper peptides like GHK Cu are being promoted for skin health, but these products are unregulated and not FDA approved,