5 Ways to Upgrade Your Skin Care in Your 30s

Retinol is one of most used and studied anti-aging ingredients — and the only one proven to prevent signs of aging. As New Orleans dermatologist Patricia Farris, MD, explained to WebMD, "they're a favorite because there's so much science behind them."

Retinol is a type of retinoid, or a topical vitamin A, that helps reduce fine lines and wrinkles by increasing the production of collagen. Retinoids can only be obtained with a prescription from a dermatologist, but, since retinol is a less potent version, they can be bought over the counter.

Try LilyAna Naturals Retinol Cream Moisturizer, $19.99, for a moisturizing anti-aging formula. Retinol can cause dry and irritated skin in some cases, but this hyaluronic acid-, vitamin E-, green tea-, shea butter- and jojoba oil-packed formula soothes and hydrates, while still fighting signs of aging (thanks to its 2.5 percent retinol).

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