The companies behind the Coppertone line of sunscreens have been hit with a lawsuit claiming they misled consumers into buying products labeled as mineral-based that actually contained a significant proportion of chemical active ingredients.

The lawsuit filed Jan. 3 in federal court in the Northern District of California claims that consumers were misled to pay more for the “mineral-based” products amid growing concern about the potential adverse health effects of chemical-based sunscreens, whose active ingredients can penetrate the skin and enter the bloodstream.