A toner typically either hydrates or exfoliates ... It’s made with a blend of AHAs — including azelaic acid, glycolic acid, kojic acid, and lactic acid — which help remove dead skin cells.

As we say goodbye to the MVP of liquid exfoliants, Biologique Recherche P50 1970, try these other expert-approved picks ...

They can come in the form of a cleanser, toner, serum, peel ... yet equally as effective, acids. "Azelaic acid is used by ...

5. Azelaic Acid How to use it: Azelaic acid can be found in prescription-strength creams as well as a prescription gel. There are also lower-grade options available in over-the-counter serums and ...

Farmacy Brighten Up 3% TXA Dark Spot Toner This juicy toner contains 3% tranexamic acid, as well as azelaic acid to soothe redness and 5% PHA to slough away dead skin cells. It’s essentially ...