Medscape (5/19, Doheny) reported, “About a third of sunscreens tested by experts…provide less than half the SPF protection claimed on the label,” according to Consumer Reports’ annual sunscreen report. According to the article, the Food and Drug Administration does not routinely test sunscreen products’ SPF.
Dr. Bader recommends sunscreens that have a high concentration of zinc oxide and/or titanium dioxide as the active ingredient(s). These are physical blockers, that reflect all of the suns rays (UVB and UVA).
Chemical blockers only work for specific wavelengths and break down, often within a few hours of sun exposure.