Now that the days are at their longest and the sun’s rays are the most direct, proper use of effective sunscreen is essential and insures that summer fun in the sun does not cause skin damage. To select the most protective products as well as the least harmful, consult the Environmental Working Group’s annual Guide to Sunscreens.

From the EWG website:

The Environmental Working Group’s mission is to empower people to live healthier lives in a healthier environment. With breakthrough research and education, we drive consumer choice and civic action.
We are a non-profit, non-partisan organization dedicated to protecting human health and the environment.
Since 2007, when EWG published its first Sunscreen Guide, many sun protection products sold in the U.S. are safer and federal regulators have cracked down on some of the worst phony marketing claims. But our investigation of more than 880 beach and sport sunscreens, 480 moisturizers and 120 lip products with SPF for our 11th annual guide found that serious concerns remain.