Who it's for: If you're looking to even out your skin tone, this leave-on toner uses glycolic and lactic acids, plus brightening licorice, to get the job done.

I like to think that OleHenriksen Glow2Oh 7% AHA Exfoliating Dark Spot Toner and I are in an open relationship. My job keeps me busy testing all sorts of other exfoliating skin-care products, but I've returned home to this little blue bottle time and time again since its launch five or six years ago. How could I not? Even with just one or two uses per week, its alpha hydroxy acids-heavy formula is the only one that can satisfy my need for clear, spotless, and blindingly dewy skin. (Two alpha hydroxy acids -- glycolic and lactic acids -- are paired with brightening licorice extract and hydrating glycerine for a dark-spot-fading, glow-inducing formula. You apply it before bed and leave it on overnight. The brand recommends doing a patch test first, by trying a small amount on your forearm.)

OleHenriksen Glow2Oh 7% AHA Exfoliating Dark Spot Toner is a part of our Allure Beauty Box product lineup for May. Subscribe to Allure Beauty Box and get editor-approved picks in makeup, skincare, hair care, and fragrance delivered right to your door every month.