GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? Peptides for Plastic Surgery: Weight Loss, Skin, Healing & Recovery What is the recommended dosage of GHK Cu (Glycyl Histidyl Lysine Copper) for topical treatment of acne and skin health on the face? When I started, all I had was Reta and electrolytes in my fridge. Now I've added Tesa, MOTS C, GHK Cu, kimchi and I've upgraded to reusable pens. : r Retatrutide