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A recent study evaluated the effects of valerian extract taken nightly on the improvement of sleep quality in postmenopausal women. Somewhere around 50 percent of postmenopausal women experience sleep disturbances, such as insomnia.
Study participants consisted of 100 postmenopausal women who were experiencing insomnia. They were randomly divided into two groups, and received either 530 mg of concentrated valerian extract or a placebo twice a day for 4 weeks.