Serotonin

Serotonin is one of several chemical messengers in the brain, or neurotransmitters, which help brain cells communicate with one another. Among many other functions, serotonin is involved in regulating mood. Problems with making or using the right amount of serotonin have been linked to many mental disorders, including depression, bipolar disorder, anxiety disorder, autism, and schizophrenia.

What is Serotonin?

Serotonin is an example of a neurotransmitter, a chemical messenger that is passed between nerve cells. When a nerve impulse reaches the axon at the end of a nerve, neurotransmitters are released which cross an area called the synapse to be received by a specific receptor on the end of a target nerve. Once received by the target nerve, the neurotransmitter may either excite that nerve to fire its own signal or prevent it from firing the signal.

Serotonin Pathology

The Relationship Between Serotonin and 5-HTP

Do Serotonin and Antidepressants Affect the Microbiome?

Serotonin and Aggression

Serotonin in Plants

Drugs Targeting the 5-HT System

Serotonin Function

Serotonin Biosynthesis

Latest Serotonin News and Research

Neural circuits in flies provide insights into human eating

Why do we sometimes keep eating even when we're full and other times turn down food completely? Why do we crave salty things at certain times, and sweets at other times? The answers, according to new neuroscience research at the University of Delaware, may lie in a tiny brain in an organism you might not expect.

30 Jan 2026

Antidepressant use does not worsen early outcomes after traumatic brain injury

Taking certain antidepressants at the time of a traumatic brain injury (TBI) is not associated with an increased risk of death, brain surgery or longer hospital stays, according to a study published on January 28, 2026, in Neurology, the medical journal of the American Academy of Neurology.

28 Jan 2026

Gut problems may shape Parkinson’s disease progression through the gut-brain axis

This narrative review examines how gastrointestinal dysfunction, gut dysbiosis, and altered gut-brain axis signaling are closely associated with the onset and progression of Parkinson’s disease. It synthesizes evidence supporting a possible bottom-up disease model while highlighting integrative, gut-targeted strategies as adjuncts to symptom management rather than proven disease-modifying therapies.

27 Jan 2026

Gambling disorder alters the brain's control and reward systems

A new doctoral dissertation shows that gambling disorder is linked to brain networks involved in self-control and brain reward functions.

21 Jan 2026

New review examines the growing global use of melatonin among pediatric populations

Sleep problems are increasingly common among children and adolescents, affecting emotional regulation, cognitive development, and healthy conditions.

16 Jan 2026

UC Davis team creates new class of serotonin-effecting drugs

UC Davis researchers have developed a new method that uses light to transform amino acids - the building blocks of proteins - into molecules that are similar in structure to psychedelics and mimic their interaction with the brain.

8 Jan 2026

The gut is not just digestive and new evidence shows it actively controls brain function

This comprehensive review synthesizes a decade of human and animal research to explain how the gut and brain communicate through hormonal, neural, immune, and microbial pathways. It highlights how disruptions in these pathways contribute to gastrointestinal, metabolic, and neurological disorders, and how modern therapies are beginning to exploit gut–brain signaling for clinical benefit.

6 Jan 2026

Acupuncture may help ICU patients recover faster

Acupuncture's multi-pathway effects in ICU patients may reduce complications, support rehabilitation, and improve recovery while minimizing medication use.

6 Jan 2026

Integrated neural probes reveal dopaminergic control of sleep-wake transitions

Understanding the dynamic neural mechanisms of sleep-wake cycles is a major challenge in sleep science and neuroengineering.

6 Jan 2026

Unlocking sleep-wake secrets with dual brain signal analysis

Understanding the dynamic neural mechanisms of sleep-wake cycles is a major challenge in sleep science and neuroengineering.

22 Dec 2025

Estrogen drives gut pain and explains higher rates of IBS in women

Women are dramatically more likely than men to suffer from irritable bowel syndrome (IBS), a chronic condition causing abdominal pain, bloating, and digestive discomfort.

18 Dec 2025

Lysophosphatidylcholines show gene-dependent effects in early Alzheimer’s disease

A new study presents robust evidence on the role of lysophosphatidylcholines (LPCs) in the onset of Alzheimer's disease. Researchers discovered that LPCs-compounds that transport a variety of healthy fatty acids to the brain-either promote Alzheimer's or protect against it, depending on a person's genetics.

17 Dec 2025

FDA panelists questioned antidepressants in pregnancy. But doctors call them a lifeline.

If you are pregnant or a new mother who is struggling with depression or anxiety, you can call or text the National Maternal Mental Health Hotline, 24/7: 833-TLC-MAMA (833-852-6262). Postpartum Support International can help connect you with a local mental health provider at 800-944-4773 or psidirectory.com.

15 Dec 2025

Why the form of vitamin B12 you take may matter more than your intake

This comprehensive review examines vitamin B12 absorption, physiological roles, deficiency states, and dietary sources, with particular attention to differences between natural and synthetic forms. The authors conclude that while all B12 forms raise circulating levels, methylcobalamin may offer advantages in specific clinical contexts, especially where absorption or metabolic conversion is impaired.

10 Dec 2025

Emotional support in marriage associated with lower BMI and fewer food cravings

Strong social relationships, particularly high-quality marriages, may help protect against obesity by influencing a complex communication system between the brain and gut, according to new research by UCLA Health.

4 Dec 2025

New study reveals how brain biology shapes thought and behavior

A new study from experts with Georgia State University has achieved a long-standing goal in neuroscience: showing how the brain's smallest components build the systems that shape thought, emotion and behavior.

2 Dec 2025

Study maps early structural damage in schizophrenia spectrum disorders

Researchers at the University of Seville have identified the possible origins of structural damage in the brains of patients with schizophrenia spectrum disorders (SSDs).

27 Nov 2025

How immune signals activate brain circuits to drive sickness-induced social withdrawal

MIT researchers have discovered how an immune system molecule triggers neurons in a specific brain circuit to shut down social behavior in mice modeling infection.

25 Nov 2025

Daily berries and cocoa enhance mood by targeting key brain pathways

Dietary flavonoids from everyday foods show modest but promising benefits for mood, with the strongest evidence emerging from chronic, anthocyanin rich interventions. Acute effects are mixed, but longer term intake may support emotional well being through mechanisms involving monoamine activity and neuroplasticity.

17 Nov 2025

Low-dose THC mitigates harmful side effects and inflammation caused by HIV treatment

Long-term, low doses of THC mitigate many harmful side effects and inflammation caused by HIV and antiretroviral therapy (ART), according to new research from Texas Biomedical Research Institute.

6 Nov 2025