All sunscreens contain chemicals regardless of whether they are touted as chemical or chemical-free. Chemicals are formed when two or more atoms are joined together. Thus, all ingredients used in cosmetics or drugs are chemicals. Sunscreens are chemicals that can protect the skin by absorbing, reflecting or scattering ultraviolet (UV) radiation. One organic sunscreen ingredient: octyl methoxycinnamate - absorbs UV radiation. Other sunscreens, such as inorganic: titanium dioxide and zinc oxide, mostly work by partially blocking UV radiation, then scattering, or reflecting energy rays.
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