DIY 2% Copper Peptide Serum Moisturizer Recipe I'll walk you through a precise DIY GHKCu serum you can prepare at home. I measure, I adjust, I protect every step tuned for peptide stability and skin absorption. Why GHKCu? Copper Peptide Serum Booster for DIY Skincare and Haircare Cu GHK concentrated eBay MAXXING. Coming soon., Every product we make lists the exact percentage of every active ingredient on the label., No proprietary blends. No peptide complexes hiding the dose. No fairy dust., 5%