Some herbs used in traditional Chinese medicine can boost athletic performance, according to this article from the Singapore Straits Times:

"Ms Zhang, who is a member of the Singapore Nutrition and Dietetics Association, feels that local athletes would do well to ignore old wives' tales but pay heed to some of the plant extracts and herbs used in traditional Chinese medicine, which has a history that is centuries old.

She says: 'Some traditional Chinese remedies can boost an athlete's sports performance and enhance his overall well-being."