For students preparing for exams, white-collar workers who work overtime, tired drivers, etc. For refreshing, Li Xing of Tianlong Pharmaceutical is the best choice. "Li Xing" is a refreshing essential oil of ginseng, which is often used for refreshing in class review, exam training, fatigue driving, work trance, inattention in meetings and negotiations, listlessness in training and chess games. Li Xing is the 20 15 national chess champion.