Cellular Glow Copper Peptide GHK Cu Serum for Face Ghk Cu Vs Retinol For Collagen Copper Peptides in Skincare: Benefits, Science & How to Use Most skincare stays on the surface., GHK Cu works deepersupporting your skin at the cellular level without the irritation cycle of retinol., No redness., No downtime., Just real support where it Retinol vs. GHK Cu Two key ingredients used to address visible signs of ageing. Retinol A popular synthetic molecule that accelerates cellular turnover and skin resurfacing, helping to promote even skin