GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK Copper, Collagen, and Controversy: Inside the GHK Cu Buzz GHK Cu Sovereign Health Performance Copper Peptides Serum for Face 2% GHK CU & 4% EGF Before and after begins with consistency. Our 10% GHK Cu formula is engineered for deep absorption to support scalp health and visible density.