For the first time in more than 25 years, U.S. shoppers have a new chemical sunscreen option. The FDA approved bemotrizinol, also called BEMT, in June, and products containing it, including formulas from Neutrogena and other manufacturers, are now reaching store shelves. Dermatologists say the ingredient fills an important gap by offering broad-spectrum protection without the white streaking and texture issues that lead some people to avoid mineral sunscreens.
BEMT is the first chemical sunscreen in the U.S. that provides dual UVA and UVB protection on its own; previously, manufacturers had to mix multiple ingredients. It also has a molecular structure large enough to limit absorption into the skin, addressing a concern that led the FDA last month to revoke approval of the older chemical oxybenzone. As part of its safety review, the FDA examined studies of BEMT in more than 500 patients and found nearly undetectable absorption, with no irritation or allergic reactions in daily use for up to three weeks.
The ingredient is also more stable in sunlight than avobenzone, the other chemical UVA filter, which is known to break down quickly. However, environmental questions remain. The European Union has found limited evidence of toxicity to coral reefs, and longer-term research is needed. Mineral ingredients such as zinc oxide are generally considered safer for reefs, though experts caution about nano formulations, whose tiny particles may be inhaled or absorbed by marine organisms.