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  1. Serotonin: What Is It, Function & Levels - Cleveland Clinic

  2. Serotonin - Wikipedia

  3. Serotonin Function and How to Increase Levels - Verywell Health

  4. Serotonin: Functions, Normal Range, Side Effects, and More

  5. What Is Serotonin? - Verywell Mind

  6. Serotonin: The natural mood booster - Harvard Health

  7. What Is Serotonin and What Does It Do? | Psych Central

  8. Serotonin: Functions, deficiency, and how to boost - Medical …

  9. What Is Serotonin? - Everyday Health

  10. Serotonin | Definition, Functions, & Facts | Britannica