Horseradish, like other members of the mustard plant family, contains a chemical compound called sinigrin. Sinigrin has been shown to help reduce inflammation by blocking or changing the parts of the immune system that cause inflammation. Horseradish root is naturally rich in antioxidants, which can help protect your body from cellular damage by attaching themselves to free radicals. Early studies also suggest that horseradish may prevent the growth of colon, lung, and stomach cancer cells. Beyond making your eyes water, horseradish may actually help your respiratory health. One study showed that a supplement containing dried horseradish and nasturtium effectively treated sinus infections and bronchitis.