And this is how it's done: Over the course of four nights, you “cycle” through your skincare products. The first two nights are dedicated to products with active ingredients – first, an exfoliant; then, a retinol. The last two nights are for “recovery,” meaning you give your skin a break and only cleanse and moisturize.

Bowe's "hero" nighttime skin care products are: a gentle milky cleanser, an exfoliating serum, a retinoid and a moisturizer, following the skin cycling routine that works best for her skin. In the morning, she consistently uses a gentle cleanser, vitamin C serum, moisturizer and sunscreen.

Dr. Bowe says a "classic" skin cycling routine looks like this: exfoliation night, retinoid night, recovery night, recovery night, repeat. However, the retinoid night can be the trickiest to navigate, as some retinoid products can irritate the skin.