GHK Cu before and after : r Biohackers 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK PSA] Finally, a Dr. explains the mechanism behind the "copper uglies" : r SkincareAddiction Peptide Therapy for Pain Management and Healing Core Medical & Wellness GHK Cu Peptide Side Effects Safety, Treatments Neurogan Health