Diatomaceous Earth or as we call it DE, is a natural product that is made by microscopic organisms called diatoms. Millions of years ago these diatoms took minerals from salt water seas and fresh water lakes and created a protective shell or shield. Billions of these fossilized skeletons accumulated on the sea and lake floors and is now used for numerous benefits in the livestock industry. OLS has put in special metering equipment to add the DE in products as high as 10%. In all OLS dairy supplements.