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.
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This work is supported in part by New Technologies for Agriculture Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.
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