Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Kava root (Piper methysticum) has a history of traditional use in the South Pacific, primarily as a ceremonial beverage for relaxation and socialization. Scientifically, kava is known to exert anxiolytic (anxiety-reducing) and sedative effects, which are attributed mainly to its active compounds called kavalactones. These compounds modulate neurotransmitter activity in the brain, particularly by enhancing GABAergic transmission, which is associated with calming the nervous system. The parasympathetic nervous system (PNS) is responsible for "rest and digest" activities, and substances that promote relaxation may indirectly support PNS activity.

Several clinical trials and meta-analyses have found that kava extracts can reduce symptoms of anxiety, which suggests a supportive effect on nervous system balance. For example, a 2011 Cochrane review concluded that kava extract is more effective than placebo for treating anxiety, though concerns about rare cases of liver toxicity persist. While kava's primary action is not directly on the PNS, its calming, anxiolytic properties are thought to facilitate parasympathetic dominance by reducing stress and sympathetic nervous system overactivity.

In summary, the use of kava root to support the parasympathetic nervous system is backed by both traditional and scientific evidence focused on its calming and anxiety-reducing effects. However, the evidence is moderate rather than strong or definitive, and safety concerns should be considered.

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