GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Copper, Collagen, and Controversy: Inside the GHK Cu Buzz Copper, Collagen, and Controversy: Inside the GHK Cu Buzz