Garlic has been fed to horses for hundreds of years, resulting in numerous health benefits.
Garlic consumption is widespread because it acts as an insect repellent and works because the high-sulphur compounds in garlic are released from the skin through natural bodily secretions such as sweat, producing an invisible barrier that flies find repulsive.
As long as the barrier lasts, flies rarely settle on the skin, greatly reducing the level of irritation and agitation normally observed.