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 NL GHK Cu protection against heart, eye, and brain diseases Synthagen PL The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Cu Peptide Before and After Results Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare