Olsson’s Arginine Horse is a block supplement that contains 4% arginine and 0.1% silymarin. Birdsville disease is a condition in horses associated with ingestion of Indigofera linnaei, which has been linked to signs such as gait incoordination and hind-limb dragging. This product is formulated as a nutritional supplement only and is not intended to diagnose, treat, or prevent any disease. Veterinary advice should be sought if symptoms occur or if pastures contain significant Indigofera linnaei growth.