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Can you use copper peptides with retinol?, The internet says its complicated. , We say its notif you understand formulation., Most brands wont tell you that copper peptides (GHK Cu) have a Skincare Routine: GHK Cu Peptide & Tretinoin Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare Copper Peptides (GHK Cu) and Retinol: Safe to Mix
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