Serotonin Basics Serotonin is a neurotransmitter that relays information to different parts of the brain. Serotonin regulates many of the vital systems in the body, including our cardiovascular, immune, and gastrointestinal systems. Serotonin also indirectly or directly controls most brain functions, such as mood, sexual function, and sleep cycles. Serotonin, Melatonin, and Sleep In “The ..
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