Ingredients/Components [Arabinoxylan] Arabinoxylan is the main component of "hemicellulose," a type of dietary fiber that forms the cell walls of plants in the grass family, such as rice, wheat, corn, and bamboo grass. Derivatives from rice bran are attracting attention in the United States, along with Maitake D-Fraction, and various arabinoxylans are also being researched in Japan recently.