Why Collagen Loss Accelerates After 40: The Role of GHK Cu in Menopaus Pure & Cimple Can Ghk Cu Cause Diarrhea GHK Cu (Copper Peptide) is a naturally occurring peptide in the body that binds with copper to support cell repair and renewal. As we age, our levels decrease and thats where supplementation or Copper Peptides vs. Retinol & Vitamin C: What to Choose? by DrBeautiology Medium PSA: Albeit rare Copper peptide "uglies" are real and scary. Case report and looking for advices : r 30PlusSkinCare