5 things that might surprise you about GHK Cu 1 Your body already makes it. GHK Cu is a naturally occurring copper peptide found in plasma, saliva, and urinebut levels decline as we age. GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms