Study: Many people choose sunscreens that don't meet medical guidlines

A study shows people who use sunscreen may be choosing products that don't meet medical guidelines for protection from the sun.

The Journal of the American Medical Association, in a study published on Thursday, said that 40 percent of sunscreen products rated highest by customers on Amazon.com don't quite cut it in protecting the skin against the sun.

The report found the products don't adhere to the guidelines set by the American Academy of Dermatology.

The factors for protection include SPF greater than or equal to 30, protection from both UVA and UVB light, as well as water and sweat-resistant sunscreens.