GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Cu is one of my personal favorites for a lot of reasons, but I can say without a doubt that it's use effectively stopped and reversed, my receiving hairline. However, there are GHK Peptide Dosage Chart PeptidesPower The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline How long will a 50 mg supply of GHKCu last when dosing 2 mg daily for five consecutive days followed by two days off each week?