Quick question, can these two products be used effectively at the same time? I'm not talking about at the exact same moment, but if I were to alternate nights or use one at night and one in the morning, would they work well with each other? Or would this limit the effectiveness and/or make things worse?
(I think I posted this originally in too specific of a forum so I'm posting it again here. )
Retinoids and Azelaic Acidazelaic acid
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