Copper Peptides vs Retinol Can You Use Copper Peptides With Retinol? There is no definitive answer as to whether retinol vs peptides are better for anti aging. However, there is a lot more research backing retinol as an effective ingredient, while peptides are still Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with Copper Peptides vs. Retinol & Vitamin C: What to Choose? by DrBeautiology Medium Copper Peptide Duo GHK Cu Anti Aging Serum & Moisturizer