In your 30s, sebaceous glands increasingly slow down, causing skin to lose moisture. After your nightly cleansing, says Dr. Wu, use a cream with ceramides to replace some of your skin's natural oils. Since cell turnover also starts to decrease, exfoliate at least once a week whether your skin is flaky or not.
YOUR KEY PRODUCTS Cera Ve PM Facial moisturizing lotion, $14; drugstore.com.
Clarins Bright Plus Gentle Brightening exfoliator, $30; sephora.com.Read MoreLess