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The vagus nerve, originating from the brainstem, innervates facial muscles, throat, respiration, digestion, and the heart. It can be stimulated orally by gargling with water or mouthwash, singing, chewing gum, sucking on hard candy, or humming.
Eating more probiotics stimulates the vagus nerve in the gut, which is connected to the brain, helping the body wind down. Exposing yourself to something cold, like a cold shower or dunking your face in cold water, also stimulates the vagus nerve. Rubbing behind your ears with two fingers may also have an effect.