According to Joseph P. Hou in his book "The Healing Power of Chinese Herbs and Medicinal Recipes," white peony root is commonly used in China to ease muscle spasms, including facial spasms. The Ontario Herbalists Association notes the use of white peony root, which is known in China as Bai Shao Yao, as an antispasmodic.
According to "Leung's Encyclopedia of Common Natural Ingredients," white peony root regulates the menstrual cycle. It's antispasmodic and analgesic properties may aid in assuaging the symptoms of PMS.
According to Ron Teeguarden in his book "The Ancient Wisdom of the Chinese Tonic Herbs," white peony root purifies the blood, consequently purifying the skin. Teeguarden relates an ancient Chinese saying that "a woman who consumes white peony root every day becomes as beautiful as the peony flower itself."