You already know that excessive exposure to the sun’s ultraviolet (UV) radiation can increase your risk for skin
cancer, but do you know the difference between UVA and UVB? Once upon a time, sunscreens only protected against shorter wave radiation known as UVB rays, which are responsible for sunburns, but research has shown that UVA rays can also cause cancer and skin damage.
Sun Protection Factor (SPF) measures a sunscreen’s ability to protect against UVB rays; there is currently no rating system for UVA protection. Choose a broad-spectrum or multi-spectrum sunscreen, paying close attention to its ingredients. Any of the following should work: ecamsule, avobenzone, oxybenzone, titanium dioxide, sulisobenzone, or zinc oxide.
Be sure to reapply sunscreen regularly, especially when swimming, because “water resistant” does not mean water proof. The Food & Drug Administration recommends reapplying sunscreen after 40 minutes of swimming.
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