This is a 100% natural deworming and parasite remover containing 15 naturally occurring minerals as well as silica which has many healing properties and is essential for healthy hair, skin and nails. DE scrapes the waxy shell off insects causing them to dehydrate and die. For external use(ticks, fleas, lice, and mites), sprinkle DE directly onto your pet and rub it into their skin and coat as well as on their bedding. For internal use(parasites, worms) add to your pets food for 30 days. (1tsp per 25lbs of body weight).