Research suggests that valerian is generally safe for short-term use by most adults. It has been used with apparent safety in doses of 300 to 600 milligrams daily for up to 6 weeks. The safety of long-term use of valerian is unknown., Valerian root seems to work best after taking it regularly for two or more weeks. Don’t take valerian root for more than a month without talking to your doctor. For anxiety, take 120 to 200 mg,, Valerian root is a popular herbal sleep aid available in tea, capsules, and tinctures. Valerian root may help improve sleep and reduce anxiety, but is not advised as a treatment for long-term insomnia. As a dietary supplement, valerian root is not closely monitored by the FDA., In terms of safety, valerian root is considered safe when used appropriately. It does interact with some medications, so speak to your health care professional before using it if you’re taking pharmaceuticals or other herbal supplements., Valerian overview for health professionals. Research supplement sources, historical uses, health effects, safety, and interactions here., Valerian root is considered safe if used for 28 days or less. Except for one study using valerian extract for eight weeks, only short-term studies of up to 28 days have been performed on valerian root..