2. Where is it Found?

The brain is the primary origin of serotonin, and the chemical is often found here. However, the brain only accounts for about ten percent of the body's supply of serotonin. The rest exists throughout the digestive and vascular systems, particularly in blood platelets. As of 2019, scientists are still researching the role it plays in these systems.

Close-up of red blood cells virusowy / Getty Images

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