Horseradish root (*Armoracia rusticana*) delivers heat through glucosinolates. These compounds break down into allyl isothiocyanate, the source of the root's sharp bite and its temporary clearing effect on nasal and sinus passages. Traditional practices rely on the plant for upper respiratory comfort, digestion, and sometimes urinary tract blends.
Fresh grated root seasons sauces and meals. Dried powder, extracts, and tinctures serve as supplements. Clinical proof for benefits is lacking. Most knowledge rests on historical and anecdotal records.
People with thyroid conditions or low iodine intake should be careful. Horseradish contains goitrogens that can disrupt thyroid function in susceptible individuals. Avoid large medicinal doses during pregnancy and breastfeeding. The root can also irritate the stomach lining. Anyone with gastritis, ulcers, or kidney disease should not use it.