evidence: Sunscreen products are intended to be applied to the body every day, over the course of a lifetime. The companies that make and sell sunscreen ingredients and products should test them thoroughly for potential short-term and long-term health effects. This includes toxicity testing for irritation and skin allergies, as well as testing for skin absorption and the potential to cause cancer, disrupt the hormone system and impact reproduction and development. [...] Four studies published in 2020, after the FDA released its draft proposal, support previous findings that oxybenzone can act as an endocrine disruptor and may increase the risk of breast cancer and endometriosis. In addition, the National Toxicology Program found equivocal evidence of carcinogenicity in rats after observing increases in thyroid tumors and enlargement of the uterus in female rats with high exposure to oxybenzone. [...] Because of the potential of exposure through inhalation, the International Agency for Research on Cancer has classified titanium dioxide as possibly causing cancer in humans. For this reason, powdered or spray formulations containing titanium dioxide are a concern. Zinc oxide is also a cause for inhalation concerns when used in spray and powder products