GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Copper Peptide Concentrate, cumpr ingredient cosmetic Time for a little GHK CU update for the people who are interested. It's day 9. I took a little break on day 5 just so my body didn't get too 'used' to GHK Cu Copper Peptide: The Ultimate Peptide For Longevity Full honest & unfiltered experience with GHK Cu 1 month after completing a 12 week cycle: Weeks 12: No noticeable changes. Weeks 34: Skin rash (rib area) worsened. Weeks 56: Extreme dryness, flaking,