Most popular sunscreens might not be the most effective

(CNN)Nearly 40% of top-selling sunscreens don’t meet the American Academy of Dermatology’s criteria, according to a new study.

The research found that popular products from well known brands such as Neutrogena and Eucerin fell short of the academy’s sunscreen recommendations due to their lack of water resistance.
    Dermatologists “are often asked to recommend sunscreens, and we wanted to know what consumers prefer,” said lead study author Dr. Steve Xu. “This way, we are suggesting popular products they will actually use that will protect them.”
    The academy recommends that everyone use sunscreen that offers broad-spectrum protection (against UVA and UVB rays), has a Sun Protection Factor (SPF) of 30 or higher and is water-resistant.
    Two industry groups urged caution about the research. “This is not an important finding since not all effective sunscreens must be water-resistant. Many consumers looking for daily use product may prefer sunscreens without this attribute, and it is not critical for the sunscreen to be effective,” the Personal Care Products Council and the Consumer Healthcare Products Association said in a statement.
    Xu, a resident in dermatology at Northwestern University, noted that rankings from the Environmental Working Group and the product evaluation magazine Consumer Reports truly do influence some consumers.
    “The label ‘dermatologist recommended’ doesn’t hold as much weight when it’s used by nearly every product,” Xu stated. “When patients ask me what sunscreen to use, I don’t recommend a specific brand, whereas EWG and Consumer Reports do.”
    “There’s definitely an impetus for us to understand these external grading systems so we can counsel our patients better,” Xu said.

    See the latest news and share your comments with CNN Health on Facebook and Twitter.

    Just because a product doesn’t meet the American Academy of Dermatology’s guidelines doesn’t mean you should stop using it, the Personal Care Products Council and the Consumer Healthcare Products Association urged. “Consumers should not take these results to mean products are not effective as claimed,” the groups said.
    This study was published July 6 in the journal JAMA Dermatology.

    Read more: