Horseradish is helpful for sinus infections because it encourages the body to get rid of mucus. Also used for common colds, influenza, lung congestion, as a natural antibiotic and to stimulate urine production. Occasionally, horseradish has been used topically to alleviate the pain of arthritis and nerve irritation. Horseradish has exceptionally high levels of Vitamin C. Used in cooking and as a condiment, Horseradish possesses a potent flavour, commonly described as hot, spicy and peppery.