What is the role of SPF in sunscreen?

The role of SPF, or Sun Protection Factor, in sunscreen is primarily to protect the skin from harmful UV radiation. SPF is a measure of how well a sunscreen can protect the skin from ultraviolet (UV) rays, specifically UVB rays, which are the rays that cause sunburn and contribute to skin cancer. The higher the SPF number, the greater the protection against UVB radiation.

When applied properly and in adequate amounts, sunscreen with a sufficient SPF can significantly reduce the risk of skin damage and its associated effects, such as premature aging and skin cancers. The effectiveness of SPF in filtering out UV radiation is critical in maintaining skin health, especially for individuals who are frequently exposed to the sun or have sensitive skin.

While hydration, cell regeneration, and prevention of skin aging are important aspects of skincare, they are not direct roles of SPF. These other factors may be supported through the use of moisturizers or other active ingredients in skincare products, but when it comes to the specific protective capabilities of SPF, its main function is to shield the skin from UV damage.