Oxybenzone (also known as Benzonephenone-3) is a chemical phtostabilizer (it prevents deterioration of the product when it absorbs light) that is used in many sunscreens, lotions, nail polishes, fragrances and hair sprays.  Despite being the most common sunscreen ingredient, it actually is a photo-carcinogen (it becomes a carcinogen by disrupting DNA cells when exposed to light) and  has been linked to an INCREASE in cancer as well as a host of other reproductive and fertility problems.  In a study of women with endometriosis - a significant cause of infertility, 97% of women with Endometriosis had elevated levels of Oxybenzone in their blood.  In addition - it also impacts male fertility.  Time to swap out your tired sunscreens and replace with one that is zinc and titanium dioxide instead!