Curicyn�s BodyGuard Fly, Flea, Tick & Insect Repellent Horse Supplement is sure to be at the top of your list to keep pesky pests away from your herd. This natural, botanical, oil-based formula is easy to use and 100% non-toxic to humans and other animal species. Because the special formula works in its vapor form via the olfactory receptors including the antennae and feet of insect pests it doesn�t need to have contact with the insect to be effective.