You know you're supposed to wash and moisturize your face. But what about all that stuff in the middle? Here's how a toner could fit in your routine.

But how do you know which toners are a sufficient P50 replacement? “A great toner should contain exfoliating acids to promote cell regeneration and balance the skin,” Mieloch says.

From K-beauty gurus to Hailey Bieber, all your favorite skin-care aficionados swear by this for weightless, radiance-boosting hydration.