Abnormally Low Levels of The Neurotransmitter Serotonin Are Associated with What?

Some nerve cells produce a chemical called serotonin, which sends signals between these same cells in the brain and throughout the body. Despite it being known for being present in the brain, the digestive system is where most of the serotonin in the body can be found. Serotonin is made from the amino acid tryptophan. …

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