The practical approach most dermatologists recommend: use retinol and copper peptides on alternating nights, or use one in the morning and one at night
Statements Data availability statement The original contributions presented in the study are included in the article/ Supplementary Material

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So, if you do choose to take an oral glutathione supplement, be sure that it is either sublingual GSH or liposomal GSH, since standard oral GSH supplements are poorly absorbed