The GHK Cu Peptide: Benefits, Uses, and Why it's Known as the Regenerative Copper Complex Copper peptide questions we get asked all the time How often should you use it? Do you need to avoid the sun? If you're new, start once daily (evenings are great), Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum Topical or SubQ GHK Cu? Same molecule. Very different purposes. Topical you apply it on your skin. Think of it as feeding your skin from the outside. In a 12 week study of GHK Cu Peptides: Unlocking the Copper Peptide Revolution in Skin Care