While traditional, outdated neuroscience dictates that orally supplemented, exogenous GABA cannot easily cross the tight cellular junctions of the blood-brain barrier to act directly on the cerebral cortex, modern neurogastroenterology reveals an alternative, profound mechanism of action66. Exogenous GABA binds directly and aggressively to abundant GABAergic receptors embedded deeply throughout the enteric nervous system of the gut microbiome66. This localized binding fiercely stimulates the afferent fibers of the vagus nerve, initiating a powerful, rapid gut-brain signaling cascade that travels entirely up to the brainstem to systemically reduce sympathetic nervous system tone, thereby effectively delivering immense anxiolytic and sedative effects without directly penetrating the brain's physical barrier66. 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