Why Food Grade Diatomaceous Earth? To find out why, spend a day in our office answering phone calls and emails You will hear some heart breaking stories. Some of these are individuals from whom DE will hopefully stop annoying indeterminate itching, relieve ever-increasing pain, or something as simple as make their fingernails strong and beautiful. The most rewarding conversations are the ones where DE has been a solution that finally worked. Diatomaceous Earth packaged under the Lumino label comes from an extremely pure fresh water deposit. It is almost pure white and consists of at least 85% Silicon Dioxide. Darker colored Diatomaceous Earth often contains an excess of other minerals such as iron, or a high percentage of clay. DISCLAIMER: Any food grade diatomaceous earth uses other than those approved by the EPA, FDA,or USDA are strictly based on other peoples personal experiences.