Womens Dong Quai Tonifier is based on the classic Chinese formula Ba Zhen Wan that has been used by Chinese herbalists and acupuncturists for over 800 years. The four chief herbs in the combination were first written about in 220 A.D.Known primarily as a nourishing tonic for women Womens Dong Quai Tonifier is among the most respected of all Chinese herbal formulas for promoting womens health. .