Experts say most of the sunscreen on the shelf isn't actually all that effective.

Researchers at the Environmental Working Group say that only a quarter of the 1,700 sunscreens assessed in their yearly sunscreen guide were found to meet their standards for safety and efficacy -- troubling news for those who use sunscreen for protection from harmful rays. 

For more on this, KCBS Radio news anchor Holly Quan spoke with Emily Spilman, Program manager for Healthy Living Science at the Environmental Working Group.