Red star anise Compared with other Illicium verum varieties, the autumn flower Illicium verum (August fruit, also called positive fruit) has more fruit, that is, the highest yield. The main component of Illicium verum is fennel oil, which can stimulate gastrointestinal nerve and blood vessels, promote the secretion of digestive juice, increase gastrointestinal peristalsis, have the effects of invigorating stomach and promoting qi circulation, and help relieve spasm and pain.