uv (ultraviolet) filters
Organic and inorganic chemicals used to reduce the amount of solar ultraviolet radiation (UVR) that skin is exposed to during the daylight. UV filters absorb, scatter and reflect sunlight, reducing acute and chronic skin damage. Examples of acute damage from sunlight include redness (sunburn) and pigmentation (tanning). Chronic skin damage from solar UV includes skin cancers, nonmelanoma and melanoma, and photoaging, i.e., irregular skin tone, fine lines and wrinkles. UV from sunlight is often referred to as UVB and UVA, referring to short and long wavelengths of UV. The UVB wavelengths are most responsible for photodamage because they have the highest energy and produce the most damage to skin. However, long wavelength UVA makes up the highest percentage of sunlight (up to 90% during early morning and late afternoon) and penetrates deeper into the skin. It is important to block ALL wavelengths of solar UV to prevent or reduce skin damage.
Two common UV filters used in sunscreen products are avobenzone, a UVA filter, and oxybenzone, a short wavelength UVA/UVB filter. Both are commonly used, FDA-approved UV filters.