Clinical trial Recruiting at 1 site Phase 2 Interventional Ages 18 to 65

Using 5-HTP and creatine to treat depression

Official title: 31P-MRS and Resting State Functional Connectivity Analysis of the Effects of 5-hydroxytryptophan and Creatine for Antidepressant Augmentation in Patients With SSRI/SNRI-resistant Major Depressive Disorder

Run by University of Utah · NCT05895747 · Data updated 2026-11-12

This study is testing whether a combination of 5-HTP and creatine can help people with depression who live at high altitudes feel better.

Quick facts

PhasePhase 2
Study typeInterventional
Ages18 Years to 65 Years
SexAll
Enrollment106 (estimated)
SponsorUniversity of Utah
Academic / other
Locations1 site (Salt Lake City, Utah)
StatusRecruiting
StartedSeptember 28, 2023
Main results expectedJuly 1, 2027
Study endsSeptember 30, 2027
Registry record updatedAugust 27, 2026
Trial IDNCT05895747 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults aged 18-65 with a current diagnosis of major depressive disorder who have been living at altitudes above 4000 feet for at least 12 weeks.

Probably not a fit

Patients with non-MDD psychiatric disorders, significant medical conditions, or those currently at serious suicide risk may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial investigates the effects of 5-hydroxytryptophan (5-HTP) and creatine monohydrate as adjunct treatments for major depressive disorder (MDD). Participants will be randomly assigned to receive either low or high doses of 5-HTP combined with creatine or a placebo for 8 weeks. The study aims to assess the impact of these interventions on biomarkers related to depression through advanced imaging techniques and blood tests. The trial focuses on individuals living at high altitudes, where hypoxia may contribute to depressive symptoms.

Why it matters

Potential benefit: If successful, this study could provide new treatment options for patients with major depressive disorder who do not respond to standard antidepressants.

How similar studies have gone: While the combination of 5-HTP and creatine for depression is relatively novel, previous studies have explored the individual effects of these agents, showing some promise in treating mood disorders.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Adults age 18-65 years inclusive
* Current diagnosis of MDD identified by the MINI (Mini Neuropsychiatric Interview)
* Current HAM-D17 score of \>= 16
* Adequate adherence to any FDA approved SSRI or SNRI for at least 8 weeks
* Right-handed
* Residing at \> 4000 ft for at least 12 weeks

Exclusion Criteria:

* Any non-MDD and non-anxiety psychiatric diagnosis, as identified by the MINI
* History of or current diagnosis of renal disease, such as chronic renal failure, acute renal failure or end stage renal disease
* Current colitis or diverticulitis
* History of or current pulmonary disease (except well controlled asthma)
* Current smoking
* History of cardiac disease or QTc \> 500ms
* History of fibromyalgia or any rheumatological condition
* History of or current seizure disorder
* Current serious suicide risk identified by the Columbia Severity Suicide Rating Scale
* Current treatment with an antipsychotic, mood stabilizer, or non-SSRI/SNRI antidepressant except for bupropion at FDA-approved doses or trazodone up to 200mg, or use of any supplements apart from standard multivitamins
* Positive pregnancy test, pregnancy, failure to use adequate birth control method
* Previous diagnosis of serotonin syndrome or evidence of serotonin syndrome
* Pre-existing eosinophilia (absolute eosinophil count \> 500/uL)
* Contraindications to MRI: ferromagnetic implants, implanted devices, claustrophobia

Where it's running

  • University of Utah Department of Psychiatry
    Salt Lake City, Utah, United States
    Recruiting

Study contacts

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.