GHK Cu Copper Peptide Hair Tonic for Fuller Looking Hair 12 Week Supply (30 mL) 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 MINOXIDIL MELATONIN GHK CU TRETINOIN CAFFEINE SCALP FOAM Beauty Refined Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum Amazon.com : Mayraki Intense Hair Treatment with Copper Peptide GHK Cu, DHT Blocker for Thicker, Stronger Hair Growth 45 ml 1.52 fl. oz : Beauty & Personal Care