The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Everything you need to know about GHK Cu WHAT IS IT? A copper peptide your body naturally produces but production drops by 60% by age 60. It's one of the most GHK Cu Peptide Therapy Brea, CA Orange County GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? Ghk Cu Intra Nasal Spray 50 mg 0.34 oz. Westend Medical Supply