Kava is obviously not recommended for those who intend to drive or conduct any activity which requires fast reaction time. Pharmaceutical grades of natural Kava root are available from reputable companies in the United States. Synthetic Kava can be produced, but does not possess the same soothing qualities of naturally extracted kavalactones from the Kava plant. The vertical rhizome and attached rootlets are harvested in the autumn of the second year's growth. These plant parts possess an unpleasant aroma due to the contained volatile oils.
Valerian root is one of the most studied plants.
These effects result from a selective neurotropic action of the root on higher brain centers. The herb's primary functional effect is to suppress and regulate the autonomic nervous system. As a result, it has been found effective in treating psychosomatic diseases and childhood behavioral disorders that involve dysregulation of the autonomic nervous system. Valerian extracts are currently used in scores of compounds and teas in Europe. Valerian is perhaps best characterized as a minor tranquilizer when administered in the form of a tea, a tincture or an extract.