Sun Protection

Ultraviolet radiation is the biggest contributor to wrinkles, spots, and sagging, which is why the last step in your routine—applying sunscreen—is arguably the most important, as UVA rays are so strong they can even penetrate glass. In addition, certain antiaging ingredients like retinol and alpha and beta hydroxy acids increase skin’s sun sensitivity, making it vital to use a sunscreen with these treatments. For all these reasons, and to protect against skin cancer, the American Academy of Dermatology recommends using an SPF 30 daily.