Which two types of UV rays does sunscreen protect the skin against?

Sunscreen is designed to protect the skin from the harmful effects of ultraviolet (UV) radiation, primarily UVA and UVB rays. UVA rays can penetrate deep into the skin and contribute to premature aging and the development of skin cancers. UVB rays, on the other hand, are responsible for causing sunburn and also play a significant role in the development of skin cancer.

The formulation of sunscreens often targets both types of rays. Broad-spectrum sunscreens specifically indicate that they protect against both UVA and UVB radiation, which is essential for providing comprehensive protection from the sun's negative effects. This is particularly important for promoting skin health and reducing the risks associated with UV exposure.

UVC rays are generally absorbed by the ozone layer and do not typically pose a risk to humans under normal circumstances, and UVD is not a recognized category of UV radiation. Therefore, the focus of effective sun protection is on UVA and UVB. By using sunscreen that protects against both, individuals can better safeguard their skin from the damaging impact of sun exposure.