The herbal ingredients enhance the warming effect of the bath and help relieve neuralgia, rheumatism, and other discomforts. This blend of seven traditional Japanese medicinal herbs gently warms the body and is effective for cold sensitivity, stiff shoulders, back pain, and fatigue recovery. Magnolia Bark (Koboku): The dried bark of branches from the magnolia tree (Magnolia obovata). Angelica Root (Toki): The dried root of the Japanese angelica plant (Angelica acutiloba) from the parsley family.