Effect of Oral 5-HTP Intake on Urinary 5-HIAA Excretion

April 11, 2018 updated by: University of Western Ontario, Canada
This is a research study looking at the effect of 5-Hydroxy Tryptophan (5-HTP) on urine excretion of 5-Hydroxyindolacetic acid (5-HIAA). 5-HTP is a common over the counter product that is sold in natural food stores and via the Internet. Increased levels of 5-HIAA in the urine can be found in a specific type of cancer, called carcinoid tumor. This study will examine the effect of oral 5-HTP intake on 5-HIAA excretion. Understanding this effect may help to determine which tests should be done in a patient with increased 5-HIAA excretion who's also taking 5-HTP.

Study Overview

Status

Terminated

Conditions

Intervention / Treatment

Detailed Description

5-HTP is a common over the counter product that is sold in natural food stores and via the Internet. It is claimed to improve sleep problems, depression, anxiety, compulsive disorders, restless leg syndrome, migraines, fibromyalgia, and low pain threshold.Increased levels of 5-HIAA in the urine can be a of a specific type of cancer, called carcinoid tumor. Urinary 5-HIAA levels can also be increased by a number of food products and drugs. Oral 5-HTP is not known as a cause of elevation of 5-HIAA in urine. However, recent information suggests that 5-HTP may cause an increase.

In this study we examine the effect of oral 5-HTP intake (100 mg at bedtime for 10 days) on 5-HIAA excretion in the urine, following a prospective, double-blind placebo-controlled study design.

Understanding this effect may help to determine which tests should be done in a patient with increased 5-HIAA excretion who's also taking 5-HTP.

Study Type

Interventional

Enrollment

8

Phase

  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Canada
    • Ontario
      • London, Ontario, Canada, N6A 4V2
        • St. Joseph's Health Care

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

16 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • 18 years and older
  • in good health

Exclusion Criteria:

  • Pregnancy
  • Intake of drugs that affect 5-HIAA excretion in urine
  • Anti-depressants
  • Participation in other studies

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Diagnostic
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Double

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Urinary excretion of 5-HIAA
Plasma Chromogranin A

Secondary Outcome Measures

Outcome Measure
Side effects

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of Western Ontario, Canada

Investigators

  • Principal Investigator: Stan HM Van Uum, MD, PhD, Western University, Canada

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

May 1, 2005

Study Completion

September 1, 2005

Study Registration Dates

First Submitted

September 23, 2005

First Submitted That Met QC Criteria

September 23, 2005

First Posted (Estimate)

September 27, 2005

Study Record Updates

Last Update Posted (Actual)

April 13, 2018

Last Update Submitted That Met QC Criteria

April 11, 2018

Last Verified

July 1, 2006

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 5-HTPSVU

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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