The Urthpet Food Grade Diatomaceous Earth contains a natural source of minerals like Potassium, Magnesium, Calcium and Iron. It is 100% safe to use on large animals, dogs and cats to maintain their good health and control fleas. It also serves as a natural dewormer and a dietary supplement. Food Grade Diatomaceous Earth can be used as a part of large animal’s daily regimen and as a pet food for small animals. This OMRI listed product will last up to a 30 day supply depending on your pet’s size. Product comes in a 5 oz. bottle.