Sun Protection Factor
Sun Protection Factor (SPF) is a measure of how well a sunscreen product will protect skin from harmful UVB rays, which cause sunburn, skin damage, and can contribute to skin cancer. The SPF number indicates how long it will take for UVB rays to redden the skin when using the product compared to how long the skin would take to redden without any protection. For example, if it takes 10 minutes for unprotected skin to start turning red, using a sunscreen with SPF 30 would theoretically prevent reddening for 300 minutes (10 minutes x 30 SPF). However, it is important to note that SPF only measures protection against UVB rays and not UVA rays, which can also cause skin damage. Therefore, it is recommended to use a broad-spectrum sunscreen that protects against both UVA and UVB rays.
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