Arrowroot is a fine, white starch milled from the roots of the *Maranta arundinacea* plant. Cooks rely on it as a neutral thickener for sauces, puddings, and baked goods.
As a supplement, people often mix the powder with water, juice, or a smoothie and drink it with meals. The starch supplies an easy to digest source of carbohydrates. Some turn to it as a bland food during digestive upset or to help firm loose stools.
The evidence behind arrowroot powder covers basic nutrition. Solid research supporting targeted health claims remains sparse.