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Showing 1–20 of 20 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: 5-HTP Clear all
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Placebo-controlled Trial of 5-hydroxytryptophan and Creatine for SSRI or SNRI Augmentation in Treatment Resistant Depression in Females

NCT02922725
View directory record Official record
Conditions
Major Depressive Disorder
Interventions
5-hydroxytryptophan and Creatine, Placebo control
Drug · Other
Lead sponsor
Brent Michael Kious, MD, PhD
Other
Eligibility
25 Years to 40 Years · Female only
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2020
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 30, 2022 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Phase 2 Interventional Results available

5-HTP and Creatine for Depression

NCT04395183
View directory record Official record
Conditions
Major Depressive Disorder
Interventions
5-Hydroxytryptophan 100 MG, Creatine monohydrate, placebo matched to 5-HTP, Placebo
Drug
Lead sponsor
University of Utah
Other
Eligibility
25 Years to 40 Years
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jul 22, 2024 · Synced Sep 6, 2026, 6:28 AM EDT
Recruiting Phase 2Phase 3 Interventional

Effects of 5HTP on the Injured Human Spinal Cord

NCT04520178
View directory record Official record
Conditions
Spinal Cord Injuries
Interventions
5-Hydroxytryptophan 100 MG, 5-Hydroxytryptophan, Carbidopa, Placebo
Drug
Lead sponsor
University of Alberta
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Aug 26, 2025 · Synced Sep 6, 2026, 6:28 AM EDT
Not listed Not applicable Interventional

A Scaleable Video Coaching Intervention for Opioid-using Mothers

NCT04749771
View directory record Official record
Conditions
Child Behavior, Parent-Child Relations, Substance Use, Substance Abuse
Interventions
Filming Interactions to Nurture Development, The Healthy Toddler Program
Behavioral
Lead sponsor
University of Oregon
Other
Eligibility
Up to 50 Years
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2025
U.S. locations
1
States / cities
Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Mar 28, 2023 · Synced Sep 6, 2026, 6:28 AM EDT
Suspended Phase 2Phase 3 Interventional

Effects of 5HTP and LDOPA on CNS Excitability After SCI

NCT04000919
View directory record Official record
Conditions
Spinal Cord Injuries
Interventions
5HTP, L-DOPA, Placebo oral tablet, Carbidopa
Drug
Lead sponsor
Jessica M D'Amico
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Oct 16, 2022 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

CSD200902: Assessment of Indoor Air Quality for a Heated Tobacco Product With Four Non-Combusted Cigarette Variants in an Environmental Testing Chamber

NCT05363254
View directory record Official record
Conditions
Tobacco Use, Smoking, Tobacco Smoking
Interventions
Marlboro Gold Box, Newport Box, Non-combusted cigarette variant 42001401, Non-combusted cigarette variant 42001399, Non-combusted cigarette variant 40007386, Non-combusted cigarette variant 42001402
Other
Lead sponsor
RAI Services Company
Industry
Eligibility
21 Years and older
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Stockbridge, Georgia
Source: ClinicalTrials.gov public record
Updated Apr 29, 2024 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

5-hydroxytryptophan and Creatine for Treatment Resistant Depression Associated With Hypoxia in Females

NCT02356107
View directory record Official record
Conditions
Major Depressive Disorder
Interventions
5-hydroxytryptophan and Creatine monohydrate
Drug
Lead sponsor
Perry Renshaw
Other
Eligibility
18 Years to 64 Years · Female only
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jan 28, 2018 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Not applicable Interventional Results available

Pharmacokinetic and Subjective Effects of Heated Tobacco Products

NCT06356610
View directory record Official record
Conditions
Tobacco Use
Interventions
Product A, Product B, Product C, Product D, Product E, Product F
Other
Lead sponsor
Altria Client Services LLC
Industry
Eligibility
22 Years to 65 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
3
States / cities
Lexington, Kentucky • Springfield, Missouri • Knoxville, Tennessee
Source: ClinicalTrials.gov public record
Updated Mar 26, 2026 · Synced Sep 6, 2026, 6:28 AM EDT
Recruiting Phase 2 Interventional

5HTP Regulation Of Asthma In Children

NCT04160910
View directory record Official record
Conditions
Mild or Moderate Asthma With Allergic Sensitization
Interventions
5-Hydroxytryptophan, Placebo
Drug
Lead sponsor
Indiana University
Other
Eligibility
8 Years to 18 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Mar 1, 2026 · Synced Sep 6, 2026, 6:28 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Effects of Exercise and 5-HTP on Cortisol Levels

NCT02187341
View directory record Official record
Conditions
Plasma Cortisol
Interventions
5-HTP, Placebo
Dietary Supplement
Lead sponsor
Benedictine University
Other
Eligibility
18 Years to 60 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Lisle, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 10, 2014 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

An RCT Evaluating the Efficacy of a Skincare Routine and Acne Supplement on Improving Acne and Other Symptoms of PMS

NCT06018168
View directory record Official record
Conditions
Acne, Premenstrual Syndrome
Interventions
Skincare Routine, MINDBODYSKIN Supplement
Other · Dietary Supplement
Lead sponsor
Clearstem Skincare
Industry
Eligibility
18 Years and older · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Feb 21, 2024 · Synced Sep 6, 2026, 6:28 AM EDT
Completed No phase listed Observational

L-5-HTP-Related EMS

NCT00001918
View directory record Official record
Conditions
Eosinophilia-Myalgia Syndrome
Interventions
Not listed
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
Not listed
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2000
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

CSD200907: A Study to Assess Elements of Abuse Liability for a Heated Tobacco Product With Four Non-Combusted Cigarette Variants

NCT05114863
View directory record Official record
Conditions
Smoking, Smoking Behaviors, Tobacco Use, Tobacco Smoking
Interventions
Product A1, Product B, Product C, Product D, Product A2, Product E, Product F, Product G, Product H, Product N
Other
Lead sponsor
RAI Services Company
Industry
Eligibility
21 Years to 60 Years
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Knoxville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jun 26, 2022 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of Daily Supplementation of 5-HTP on Body Composition

NCT05216406
View directory record Official record
Conditions
Body Composition
Interventions
5-HTP, Placebo
Dietary Supplement · Other
Lead sponsor
Nova Southeastern University
Other
Eligibility
18 Years to 60 Years
Enrollment
65 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Boca Raton, Florida
Source: ClinicalTrials.gov public record
Updated Feb 11, 2025 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Poweroff Sleep Study

NCT03364101
View directory record Official record
Conditions
Sleep
Interventions
Placebo Capsule, POWEROFF Capsule
Dietary Supplement
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 21, 2018 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Phase 2 Interventional Results available

ERG/5-HTP in Fragile X Syndrome (FXS)

NCT05030129
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
5-Hydroxytryptophan, Ergoloid Mesylates, Matching placebo for Ergoloid mesylates, Matching placebo for 5-Hydroxytryptophan
Drug
Lead sponsor
Elizabeth Berry-Kravis
Other
Eligibility
18 Years to 45 Years · Male only
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Supporting Early Learning Study

NCT04107506
View directory record Official record
Conditions
Child Behavior, Parent-Child Relations
Interventions
Filming Interactions to Nurture Development, The Healthy Toddler Program
Behavioral
Lead sponsor
University of Oregon
Other
Eligibility
12 Months and older
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2025
U.S. locations
1
States / cities
Eugene, Oregon
Source: ClinicalTrials.gov public record
Updated Dec 9, 2025 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

BAT3221032: A Study to Evaluate the Effects of Switching From Cigarette Smoking to Using One of Five Variants of a Heated Tobacco Product on Biomarkers of Exposure and Biomarkers of Potential Harm in Healthy Subjects

NCT05142436
View directory record Official record
Conditions
Smoking, Tobacco Use, Tobacco Smoking
Interventions
Product A: Non-Combusted Cigarette Variant 42001402 and product use Mode B, Product B: Non-Combusted Cigarette Variant 42001399 and product use Mode B, Product C: Non-Combusted Cigarette Variant 42001401 and product use Mode B, Product D: Non-Combusted Cigarette Variant 40007386 and product use Mode B, Product E: Non-Combusted Cigarette Variant 42001402 and product use Mode A
Other
Lead sponsor
British American Tobacco (Investments) Limited
Industry
Eligibility
26 Years to 55 Years
Enrollment
806 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
18
States / cities
Bentonville, Arkansas • Little Rock, Arkansas • Rogers, Arkansas + 14 more
Source: ClinicalTrials.gov public record
Updated Dec 15, 2022 · Synced Sep 6, 2026, 6:28 AM EDT
Completed Not applicable Interventional Results available

Changes in Biomarker of Exposure in Adults Who Smoke Cigarettes Switching From Cigarettes to Heated Tobacco Products

NCT06179290
View directory record Official record
Conditions
Tobacco Use
Interventions
Ploom HTP Menthol HTS; MX3 (681), Ploom HTP Tobacco HTS; R8 (120), Smoking Abstinence (menthol), Smoking Abstinence (non-menthol)
Other
Lead sponsor
Altria Client Services LLC
Industry
Eligibility
22 Years to 65 Years
Enrollment
921 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
8
States / cities
Bentonville, Arkansas • Rogers, Arkansas • Overland Park, Kansas + 5 more
Source: ClinicalTrials.gov public record
Updated May 26, 2026 · Synced Sep 6, 2026, 6:28 AM EDT
Recruiting Phase 2 Interventional

5-HTP and Creatine for Depression R33 Phase

NCT05895747
View directory record Official record
Conditions
Major Depressive Disorder
Interventions
Low Dose 5-hydroxytryptophan, High Dose 5-hydroxytryptophan, Low Dose Creatine Monohydrate, High Dose Creatine Monohydrate, Placebo
Drug
Lead sponsor
University of Utah
Other
Eligibility
18 Years to 65 Years
Enrollment
106 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Aug 26, 2026 · Synced Sep 6, 2026, 6:28 AM EDT