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Where is serotonin produced in the brain?

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Serotonin cannot cross the blood-brain barrier, so any serotonin that is used inside the brain must be produced inside the brain. Function. As a neurotransmitter, serotonin relays signals between nerve cells, or neurons, regulating their intensity. read more

Serotonin's presence in insect venoms and plant spines serves to cause pain, which is a side-effect of serotonin injection. Serotonin is produced by pathogenic amoebae, and its effect in the human gut is diarrhea. Its widespread presence in many seeds and fruits may serve to stimulate the digestive tract into expelling the seeds. read more

While serotonin is an important neurotransmitter in the brain, around 98 percent of the serotonin found in the body is located in blood platelets, mast cells and the digestive tract. While both forms of serotonin are produced from the amino acid tryptophan, only those neurotransmitters synthesized in the brain can affect the brain: serotonin formed in the body cannot cross the blood-brain barrier. read more

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Serotonin Project
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