Do you know how to decipher the ingredients label on your moisturiser? Or whether you should be using retinol? Or what the difference is between AHAs and BHA? Relax and let the Vogue Skincare Alphabet break it down. What is it? Copper peptide GHK-Cu is found naturally in the human body, and combines the element copper with three amino acids, making it a tripeptide. What is it used for? Copper peptides have antioxidant and anti-inflammatory effects and ...