Bioflavonoids being flavonoids for use as a dietary supplement; bioflavonoids from lemons being flavonoids for use as a dietary supplement; lemon bioflavonoids including flavonoids eriocitrin, eriodictyol and hesperidin being flavonoids for use as a dietary supplement; bioflavonoids, citrus derivatives, citrus concentrates, food herbs and powders for use as nutritional supplements