What are the FDA rules on sunscreen claims?

Using broad spectrum sunscreen when spending time in the sun can help prevent not only sunburn but also premature skin aging, and skin cancer—if you choose the right product. Now sunscreen labels will let consumers know for sure if they're getting adequate protection from the sun's ultraviolet A (UVA) and B (UVB) rays. According to Food and Drug Administration (FDA) rules, sunscreens must pass a standardized test that measures the amount of UVA protection relative to the amount of UVB protection in order to be labeled "broad spectrum."

What's more, going forward, only broad spectrum sunscreens with a sun protection factor (SPF) of 15 or higher can claim to reduce the risk of skin cancer and early skin aging when applied regularly and used with other sun protection measures. Sunscreen with an SPF of less than 15 can be labeled "broad spectrum" if it passes the standardized test but must include a warning that it cannot prevent early skin aging or skin cancer. 

Sunscreens cannot claim to be waterproof or sweat proof, or use the term "sun block," according to the FDA. These terms are misleading. Instead, sunscreen labels must indicate how long it takes the product to wear off in water.

The FDA also seeks to limit the highest SPF rating to 50, since data has not shown that products with an SPF of greater than 50 offer more protection.