Kava is a supplement made from the roots of the Piper methysticum plant. It has a long history of use for relieving stress and anxiety in traditional herbal medicine, and research suggests that it does offer some stress-relieving benefits.
However, researchers have also noted rare cases of liver damage arising from kava use.
Not enough information is available about these episodes to allow researchers to confidently create dosing or safety guidelines. For this reason, we recommend avoiding kava and choosing alternatives that have a better safety profile.