GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health GHK Cu Peptide: What It Does for Body Composition and Metabolic Health Hot take: Not FDA approved isn't the mic drop people think it is. A LOT of things in your daily routine aren't FDA approved either and you probably used them all