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  1. Serotonin: Functions, Normal Range, Side Effects, and More - Healthline

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

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

  4. What Is Serotonin? - Verywell Mind

  5. What Does Serotonin Do? Neurotransmitter Function - Simply Psychology

  6. Serotonin - Wikipedia

  7. What Is Serotonin? | Mental Health America

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

  9. Serotonin: What It Is, Functions And Normal Ranges - Forbes

  10. Serotine | The Wildlife Trusts