Yin Chiao is one of the most valued of all classic Chinese herbal formulas for optimal health during the changing seasons. Planetary Herbals Yin Chiao-Echinacea(TM) combines this time-honored classic with America's primary immune supporting botanical, echinacea. The addition of Chinese isatis and notopterygium, along with North American boneset and elecampane, completes this dynamic health combination.