The fruit of Citrus aurantium has been used as a medicinal
herb in China for decades. This has led some nutritionist to try the medical
benefits of the bitter orange to help control weight gain. Citrus aurantium is
commonly referred to as bitter orange. Zhi shi is the immature dried fruit of
citrus aurantium. Zhi shi has bee used in Traditional Chinese Medicine to treat
chest congestion and stimulate gastrointestinal functions. In recent years this
supplement has been promoted for appetite control.