Can some one please clarify what Dr B means when she says:


Are you using a product that contains glycolic acid and a product that contains retinol at the same time? Better rethink your routine -- alpha hydroxy acids (like glycolic acid) inactivate retinol, and the two ingredients should not be used together.

Does this mean directly after one another in a day......or at anytime during the same day both should not be used?
I use renova (almost daily) and a mask periodically with glycolic acid in it....is this ok?