Cosmetic Colorant, Opacifying, UV Absorber, UV Filter
Titanium dioxide is one of the most common physical UV blocker ingredient for sunscreens. Titanium Dioxide is also chemically inert, making it a crucial ingredient for sensitive skin types. Furthermore, Titanium Dioxide can be scaled down to nano-particles, making it highly unlikely to clog pores. It is often used in conjunction with other sunscreen chemicals to boost the product’s SPF value, thus reducing the risk of irritation or allergies attributed to excessive usage of chemical sunscreens. The smaller the particle size, the more unobtrusive TiO2’s application. Large particles, on the other hand, leave a whitish wash or look on the skin. (Source : Michalun) There's debate in the scientific community on the dangers of nano-particles penetrating deep into the skin, however recent studies have dismiss such claims.