Also known as silica, Silicon Dioxide is used as an anti-clumping additive to avoid clumping in foods. While there are other forms of Silica, we rated the form found as an additive in the food supply, synthetic amorphous silica (SAS). Synthetic amorphous silica is produced synthetically through a vapor phase hydrolysis process or using nanotechnology. It’s a combination of silicon and oxygen molecules. There is limited long term data on the health effects of SAS. All current studies show no adverse effects in the ingestion of SAS currently. One concern is that different forms of SAS may have different behaviors on the body and there’s no way to know which form the food company uses. Another concern is the use of nanotechnology in the processing of SAS, which can change the chemical makeup of the compound.