5 Hydroxytryptophan News and Research

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Study offers new insight into the earliest steps of cataract formation

Cataracts are a leading cause of blindness worldwide and are considered a priority disease by the World Health Organization.

4 Mar 2026

Gut bacteria found to make serotonin and boost intestinal motility

Researchers have identified Limosilactobacillus mucosae and Ligilactobacillus ruminis as human gut bacteria capable of producing serotonin by decarboxylating 5-hydroxytryptophan (5-HTP). Their activity enhances intestinal motility and enteric nerve density, linking microbial serotonin synthesis to gut function and potential IBS mechanisms.

21 Oct 2025

Research reveals molecular details of ME/CFS and long COVID

Patients with chronic fatigue syndrome/myalgic encephalomyelitis (ME/CFS) have heightened innate immune responses to bacteria, viruses, and fungi. While these responses are essential to fight infection, they can cause damage when unchecked.

1 Sep 2025

NUS study finds 5-HTP enhances sleep quality and gut health in older adults

National University of Singapore (NUS) nutritionists have found that 5-Hydroxytryptophan (5-HTP) supplementation can improve sleep quality in Singaporean older adults, particularly in individuals with poor sleep patterns, and manage their gut microbiome composition.

7 Aug 2024

What are the associations of metabolome, microbiome, and immune perturbations with severe COVID-19?

In a new study, researchers observed that coronavirus disease 2019 (COVID-19) progression and inflammatory responses are associated with changes in the metabolome and microbiome.

8 Dec 2022

MOO can alleviate depression via increasing 5-HTP in the gut microbiota, study reveals

Announcing a new article publication from Acta Pharmaceutica Sinica B. Morinda officinalis oligosaccharides(MOO) is an oral drug approved in China for the treatment of depression in China.

5 Sep 2022

Is mask-wearing effective in preventing SARS-CoV-2 transmission?

UK-based researchers released the findings of their review of the efficacy of the face coverings and masks in preventing transmission of coronavirus disease 2019 (COVID-19).

4 Dec 2020

Review of research evidence suggests increased suicide rates in high-altitude areas

High-altitude areas - particularly the US intermountain states - have increased rates of suicide and depression, suggests a review of research evidence in the Harvard Review of Psychiatry. The journal is published by Wolters Kluwer.

11 Mar 2019

Vitamin and mineral supplements can enhance mental energy and well-being

Vitamin and mineral supplements can enhance mental energy and well-being not only for healthy adults but for those prone to anxiety and depression, according to a July 15 panel discussion at the 2013 Institute of Food Technologists (IFT) Annual Meeting & Food Expo- held at McCormick Place.

17 Jul 2013

Jefferson experts review most commonly used CAM practices for mood disorders

Mood disorders are among the most prevalent mental health issues today. While medication is available, more and more people are turning to complementary and alternative medicine (CAM), including herbal remedies, acupuncture, and meditation to help manage their mood disorders.

22 Sep 2011

Safe natural extracts reduce hunger and help control appetite

Klaumwell Research Labs, LLC, U.S., a subsidiary of Italian multinational Medestea Internazionale, announced positive results from a double-blind, placebo-controlled clinical study published in the prestigious, peer-reviewed International Journal of Obesity which demonstrates the efficacy of key ingredients contained in a new appetite control spray. Fullfast™ is a clinically tested dietary supplement that helps reduce excessive feelings of hunger.

28 Jan 2010

Merck Serono's Kuvan receives European marketing authorization

Merck Serono, a division of Merck KGaA, Darmstadt, Germany, today announced that the European Commission has granted marketing authorization for Kuvan(R) for the treatment of hyperphenylalaninemia (HPA) in phenylketonuria (PKU) or BH4 deficient patients.

10 Dec 2008