Note: She says, "We make a big distinction between deworming and parasite control. Diatomaceous earth is not really a dewormer, but I consider it to be a form of parasite control. If the parasites get out of control, then you need a dewormer. I see people that throw the baby out with the bath water, saying they don't want to use toxic chemical wormers, so they quit deworming their horses altogether, and end up in trouble. It's important to make this distinction."