Saw this reported on TV, found it online...
Study: 85% of sunscreens ineffective
Oh, don´t worry. The Environmental working group (EWG) are alarmists. They use chemical info from industrial applications and draw conclusions about their safety in cosmetics. They think almost all ingredient are dangerous, check their database.
But I agree with one thing though, most of the sunscreens in the US can definitely be improved upon. And starting with Neutrogena, Loreal and Aveeno (J&J) I see that happening right now. More companies will follow with stabilized avobenzone and other innovations.