Peptual FirmRestore 3% GHK Cu Serum Aestha Clinic Oral Liposomal Copper GHK Liposomal GHK Cu Supplement Copper peptide questions we get asked all the time , How often should you use it? Do you need to avoid the sun?, If youre new, start once daily (evenings are great), then build up if your skins Amazon.com: Neurogan GHK Cu (Copper Peptide) Neck & Face Serum 1,200mcg (1 oz bottle) : Beauty & Personal Care