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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT02838732
Other study ID # 201507055MINC
Secondary ID
Status Completed
Phase N/A
First received
Last updated
Start date May 18, 2016
Est. completion date October 7, 2019

Study information

Verified date December 2023
Source National Taiwan University Hospital
Contact n/a
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

In this project, the investigators aim to explore the impact of dietary L-carnitine supplementation on the TMAO production capacity of gut microbiota.


Description:

Recent studies have established plasma trimethylamine N-oxide (TMAO) levels as a strong, independent risk factor for cardiovascular disease. TMAO is produced by the interaction between gut microflora and ingested L-carnitine from food. Research indicates that both plasma TMAO concentration and the TMAO production capacity of gut microbiota in vegetarians are significantly lower than in omnivores, likely due to the reduced L-carnitine intake in vegetarian diets. This study aims to explore the impact of L-carnitine supplementation on the TMAO production capacity of human gut microbiota and to identify TMAO-producing bacteria within the gut microflora. The study plans to recruit both omnivore and vegetarian volunteers to undergo a one-month L-carnitine supplementation, followed by an evaluation of changes in TMAO production using an oral L-carnitine challenge test, along with gut microbiota assessment. TMAO concentration will be measured using LC-MS/MS, and gut microbiome analysis will be conducted through shotgun metagenome sequencing. Bioinformatic analysis may reveal potential TMAO-producing bacteria. Understanding the changes in TMAO production and gut microbiota composition post-L-carnitine supplementation may enhance our knowledge of the interplay between L-carnitine supplements, TMAO, and gut microflora.


Recruitment information / eligibility

Status Completed
Enrollment 56
Est. completion date October 7, 2019
Est. primary completion date November 20, 2017
Accepts healthy volunteers Accepts Healthy Volunteers
Gender All
Age group 20 Years to 65 Years
Eligibility Inclusion Criteria: - Healthy subjects aged 20 to 65 years old - no usage of antibiotics within one month - no use of carnitine supplement within one month Exclusion Criteria: - having serious GI disorder - medical history of myasthenia gravis - history of diabetes, - history of hyperparathyroidism, - history of chronic kidney disease - history of epilepsy - history of severe anemia

Study Design


Related Conditions & MeSH terms


Intervention

Dietary Supplement:
L-carnitine supplementation (500 mg per tablet per day, purchased from GNC company)


Locations

Country Name City State
Taiwan National Taiwan University Hospital Taipei

Sponsors (1)

Lead Sponsor Collaborator
National Taiwan University Hospital

Country where clinical trial is conducted

Taiwan, 

Outcome

Type Measure Description Time frame Safety issue
Primary TMAO level plasma and urine TMAO concentrations of oral carnitine challenge test Before and 1 month after L-carnitine supplementation
Primary Compositional and functional alterations of gut microbiota The compositional and functional changes of gut microbiota will be evaluated by shotgun metagenome sequencing. Taxonomy will be calculated as relative abundance of species-level genome bins (SGBs) and specific bacteria genes will be quantified as Reads Per Kilobase per Million (RPKM). Before and 1 month after L-carnitine supplementation
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