Before heading to the beach, most people make sure to pack a bottle of sunscreen. After all, the ultraviolet rays can be seriously damaging and no one wants to get skin cancer. But it turns out some ingredients in hundreds of common sunscreens don’t work as well as advertised, according to a new report released by the Environmental Working Group (EWG). Additionally, 73 percent of 880 sunscreens that were tested contain “worrisome” ingredients people may not want to slather on their skin.