Two Ingredients. Real Hair Transformations. How Neurogan Health's GHK Cu Serum Is Changing What Customers Expect From Hair Care Hair Growth Serum Intense with Copper Peptide GHK 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 GHK Cu: Skin Healing, Anti Aging, & Hair Growth Benefits