However, very limited studies have examined any of the possible health effects of diatomaceous earth on humans ... controlled study is required. Food-grade diatomaceous earth is safe to consume.

There are two main types, or grades, of diatomaceous earth: Food-grade, with less than a percent of crystalline silica, is the only type considered safe around food and can be used inside the home ...

Diatomaceous Earth: A Natural Remedy for Dogs ... food-grade and industrial-grade. Only food-grade DE is safe for use around ...