Your body made this peptide every day until you turned 30. Then it stopped. GHK Cu (copper peptide) is a naturally occurring tripeptide discovered in 1973. At age 20, your plasma levels sit GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Unlocking the Benefits of GHK Cu: How to Determine the Right Dosage for You Your Health Magazine