What's in it? Octinoxate
Other names it goes by: Octyl methoxycinnamate, ethylhexyl methoxycinnamate, propenoic acid.
What's it used in? Sunscreens, lip balms, some cosmetics.
What does it do? Filters and absorbs the sun's ultraviolet rays.
Any controversy? Tests on animals show it effects their hormonal system, thyroid and brain signalling.