Planetary Herbals Women's Dong Quai Tonifier is based on the classic Chinese formula, Ba Zhen Wan, which has been in continued use by Chinese herbalists and acupuncturists for over 800 years. The four chief herbs in the combination were first written about in 220 A.D. Used primarily as a nourishing tonic for women, Women's Dong Quai Tonifier is among the most respected of all Chinese herbal formulas for supporting and maintaining gynecological health.