These kavalactones act on the stem and other parts of the brain to induce a mild tranquilizing effect. A single, large dose can cause intoxication and drowsiness. Other Facts Kava is derived from Piper methysticum. Kava is a member of the black pepper family. Kava is native to the Pacific Islands, where it has been used in religious and social events for hundreds of years.
Parts used are the root.
Relevant Studies Anticonvulsant effects of kava. Eur J Pharmacol, Nov. 1996. Allergic reaction and kava. Orally administered kava can cause an allergic reaction in some users. The reaction is exhibited as eczema.