A substance found in several locations in the human body. It is made in the central nervous system where it has many functions as a neurotransmitter. It is thought to play roles in moods, cognition, learning, reward and memory. It is found in the digestive tract and blood platelets. It plays a role in digestion, gut motility, blood clotting, wound healing and pain control.
It is a monoamine derived metabolically from tryptophan, an essential amino acid. Tryptophan is found in eggs, salmon, red meat, chicken, dairy products, beans, potatoes and bananas
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