ADD / ADHD

  1. Home
  2. Health
  3. ADD / ADHD

Serotonin - What is Serotonin

By Keath Low, About.com

Updated: August 14, 2008

About.com Health's Disease and Condition content is reviewed by the Medical Review Board

Definition: Serotonin is a neurotransmitter, or a chemical messenger that helps to relay messages from one brain cell to another. It is involved in sleep, appetite, sex as well as mood and anxiety modulation.

Explore ADD / ADHD

About.com Special Features

We comply with the HONcode standard for trustworthy health information: verify here.

ADD / ADHD

  1. Home
  2. Health
  3. ADD / ADHD
  4. Glossary
  5. Glossary: Q-Z
  6. Serotonin - What is Serotonin

©2009 About.com, a part of The New York Times Company.

All rights reserved.