Chinese Compound For Immune Support Herbal Supplement Formulated by Michael Tierra L.Ac, O.M.D 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 Complex combines this time-honored classic with America's primary immune supporting botanical, echinacea. The addition of Chinese isatis and notopterygium, along with boneset and elecampane, from the North American herbal tradition, completes this dynamic health combination.