AHK Cu vs GHK Cu Difference Between GHK Cu and AHK Cu 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 Microneedling to tighten loose skin around waist after weight loss: is the tightness permanent? : r Microneedling Glow season starts now Our GHK Cu Microneedling Facial is a skin game changer. This powerful copper peptide works deep within the skin to: Stimulate collagen Repair damaged skin Smooth Hair Loss Breakthroughs or Media Hype?