A recent study conducted by the FDA and published in the Journal of the American Medical Association revealed that commonly used chemical sunscreens are absorbed into the bloodstream at potentially toxic levels after just one day of use. Instead of physically deflecting UV light away from the skin like a mineral sunscreen would do, chemical sunscreens absorb the UV radiation into the skin and dissipate the energy via a chemical reaction under the skin. Additionally, there is concern that chemical sunscreens can permeate the skin and cause hormone disruption. Common chemical sunscreen ingredients to avoid include oxybenzone (one of the worst offenders), avobenzone, octisalate, octocrylene, homosalate, and octinoxate.