What does SPF stand for in sunscreen products?

SPF stands for Sun Protection Factor. This term is crucial as it indicates the level of protection available from a sunscreen against ultraviolet (UV) radiation, specifically UVB rays, which are primarily responsible for causing sunburn and can contribute to skin cancer. The SPF number helps consumers understand how much longer they can stay in the sun without burning compared to if they were not wearing sunscreen at all. For example, if someone normally begins to burn after 10 minutes of sun exposure, using a sunscreen with SPF 30 theoretically allows them to stay in the sun for 300 minutes before burning, although this can vary based on skin type and other factors. The higher the SPF, the greater the level of protection, though it is still essential to apply it generously and reapply it as needed. Knowledge of SPF is vital for estheticians and anyone involved in skin care, as it plays a significant role in skin health and prevention of sun damage.