How Our Women's Hair Growth Kit Works: Ingredients & Protocols Eden Most people use GHK Cu way too early after microneedling and end up blunting the exact collagen signaling window they're trying to trigger. In this video I break down the biology of why I GHK Cu for Hair: Can It Stimulate Follicles & Help Hair Growth? Copper peptides can be used in routines that include dermarolling but many people choose to separate them and focus on timing rather than applying immediately after. #ghkcu #copperpeptides