Can horses eat garlic?

Garlic is something to think about carefully. It's actually good for horses in moderate amounts - too much garlic can cause anemia (they recommend half an ounce to two ounces a day). It can act as a natural fly repellent and can boost appetite. You can buy garlic supplements, but some people think you should just give the horse fresh crushed garlic. Obviously, some horses don't like the taste.