Selected Biomarkers Revealed Potential Skin Toxicity Caused by Certain Copper Compounds Scientific Reports PSA] Finally, a Dr. explains the mechanism behind the "copper uglies" : r SkincareAddiction Ghk Cu Side Effects Metallic Taste Most people think they need to take copper peptides. But Your body already produces its own copper peptide called GHK Cu. But levels naturally decline with age. So Instead of trying to replace