GHK Cu Peptide Before and After Results Two Weeks on GHK CU by Rory Uphold The Ladies Room GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? People are searching for the GHK Cu pen. Ordering it online. Trying to figure out how to use it safely at home. We looked at all of that and thought: there has to 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),