Can I use natural compounds such as BT, diatomaceous earth, or dolomite to deworm my horses?

Research studies on natural compounds including BT, diatomaceous earth, and dolomite have not demonstrated effectiveness against gastrointestinal worms in horses, although their unproven use is published in lay print and Internet non-scientific literature. Since none of these compounds have been approved by the FDA for dewormers, their use in deworming horses is a violation of Federal law.