Silica is considered safe when taken in food amounts, but antacids that contain silicone can lead to kidney stones when taken for extended periods of time, according to WebMD. The safety level of silicone when taken in larger amounts as a medication is not known.
Silica is recognized as a safe substance by the Food and Drug Administration, according to Drugs.com. Silica is a natural substance that is found in the earth's crust, as well as in plant life, water and animals. Alternative names for silica are silicon dioxide, colloidal silicon dioxide, sand and quartz.
Silica is also found in certain vegetables, grains and beer, according to NYU Langone Medical Center. Chemicals that contain silica are commonly added to products such as salt and baking soda in order to prevent the ingredients from caking. Certain studies have shown that increased intake of silica can be linked to stronger bones. Studies have also shown that silica supplements are essential in improving the texture and elasticity of the skin, and strengthening the nails. The typical recommended dose for silicon when utilized as a supplement is approximately 10 to 30 milligrams per day. Maximum safe silicon dosage amounts for pregnant women, children or those with kidney conditions has not been determined.