Wholistic Diatomaceous Earth (DE) consists of the dried skeletons of microscopic sea creatures called diatoms. Wholistic Diatomaceous Earth is a safe, non-chemical alternative to chemical dewormers. Wholistic Diatomaceous Earth™ comes from fresh water deposits. Simply sprinkle over food daily. This product may also be used against insects on the dogs skin and coat. Simply sprinkle on coat every few days and rub or brush in.