Evidence supporting the use of: Waterhyssop
For the body system: Parasympathetic Nervous System

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Synopsis

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

Waterhyssop (Bacopa monnieri), also known as Brahmi, has been traditionally used in Ayurvedic medicine to support cognitive function and mental clarity. In the context of the parasympathetic nervous system, which governs “rest and digest” functions, Bacopa is believed to promote relaxation, reduce stress, and support overall nervous system balance.

Scientific research provides some validation for these effects. Several animal and human studies have shown that Bacopa monnieri extract exhibits anxiolytic (anxiety-reducing) and adaptogenic (stress-modulating) properties. These effects are thought to be mediated by the herb’s capacity to modulate neurotransmitter levels, particularly acetylcholine, and its antioxidant properties, which may protect neural tissues. Some studies indicate that Bacopa may enhance vagal tone (associated with parasympathetic activity), reduce cortisol levels, and improve heart rate variability, all markers of increased parasympathetic function. However, these findings are preliminary, and the majority of clinical trials have focused on cognitive enhancement rather than direct modulation of the parasympathetic nervous system.

In summary, while there is some scientific backing (moderate quality, hence a rating of 3) for the use of waterhyssop in supporting the functions associated with the parasympathetic nervous system—primarily through stress reduction and neuroprotection—more targeted research is required to conclusively establish its effects on this specific body system.

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