Herbal supplement. Formulated by Michael Tierra, L.Ac., O.M.D. Chinese compound for changing seasons. Yin Chiao has been a staple of traditional Chinese herbalists and acupuncturists, and a household name in China, for hundreds of years. It was developed during the Qing Dynasty (1644-1911) and is one of the most valued of all classic Chinese herbal formulas. It is used for imbalances associated with seasonal changes. Planetary Herbals Yin Chiao classic is manufactured domestically to insure the purity of this time-honored classic. (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease).