5 Ways to Upgrade Your Skin Care in Your 30s

Ascorbic and L-ascorbic acids — or vitamin C — is an antioxidant, that protects the skin from sun damage and, like retinol, helps promote collagen production. Vitamin C can also lighten brown spots and fade acne scars, for an overall brighter complexion. It's available in many forms, but try it in a serum for the biggest anti-aging benefits — and to achieve that coveted radiant glow.

My go-to is the Cosrx Triple C Lightning Liquid, $27, which is formulated with 20.5 percent pure vitamin C! It also contains 72 percent black chokeberry to stabilize the high concentration of vitamin C and offer extra hydration for the skin.

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