Silica is widespread in nature and exists, for example, in the form of sand or in various plants. Synthetic amorphous silica (SAS) can be found in various consumer goods and in processed foods. Therefore, natural and synthetic silica can be absorbed through breathing and nutrition. Most of the absorbed silica is removed entirely and in unchanged form from the body. No significant amounts of silica can enter the body via the skin - e.g. through cosmetics.