GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? 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 This compound has been studied for over 50 years. Most people discovered it last year on social media. In 1973, Dr. Loren Pickart identified GHK Cu while studying why young blood could The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline