H.A. intensifier after retin-a

Question: I bought SkinCeuticals H.A. Intensifier for my husband. We know that it can be used after a Retinol. What about after Retin-A? Thank you,

Thank you for reaching out to us. Most definitely afer any Retinol derivative product , you can actually apply the HA5 first if you want as well.

Hope this helps, have a nice day !