Evaluation of a Short Course of Gamma Tocopherol Supplementation in Adult Subjects


To evaluate serum levels of gamma tocopherol and it's metabolites after 3 doses, each separated by 12 hours.

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: N/A
    • Intervention Model: Single Group Assignment
    • Primary Purpose: Basic Science
    • Masking: None (Open Label)
  • Study Primary Completion Date: February 2016

Detailed Description

In previous studies the investigators have demonstrated that gamma-tocopherol-enriched (yT) supplementation decreased systemic oxidative stress, increased serum levels of yT, and inhibited monocyte responses to LPS without any adverse health effects. Free Radic Biol Med. 2008 Jul 1;45(1):40-9. doi: 10.1016/j.freeradbiomed.2008.03.002. Epub 2008 Mar 12. Oxidant stress plays an important role in mucosal inflammation. Oxidant stress occurs individuals after exposure to air pollution, including high levels of ozone, LPS exposure and woodsmoke particle exposure. Potential exposure to all of these are naturally occurring events. Previous studies have also shown that asthmatic individuals tend to have lower endogenous levels of antioxidants such a s vitamins E and C, and that supplementing antioxidants can decrease exacerbation's associated with ozone exposure in children. The investigators are interested in future studies to examine the benefits of a rapid gamma tocopherol supplement in individuals who will be exposed to air pollution, either in a controlled chamber study or in a real life event, such as during high O3 days or when a woodsmoke fire is in their neighborhood. This study is to address the question: can the investigators see an increase in serum levels of gT with a shorter course of gT supplementation? Additionally, before embarking on other investigations of gT as a potential prophylactic supplement, it is prudent to determine is discernible levels can be achieved with a shorter dose of gT.


  • Dietary Supplement: Gamma tocopherol
    • 3 doses of 1400 mg gamma tocopherol (2 capsules, each is 700mg), at 12 hour intervals

Arms, Groups and Cohorts

  • Experimental: Gamma Tocopherol
    • Subjects will ingest 1400 mg gamma tocopherol, orally administered in 3 doses separated by 12 hours.

Clinical Trial Outcome Measures

Primary Measures

  • Change in gamma tocopherol serum levels
    • Time Frame: Baseline, 30 hours after initial dosing

Secondary Measures

  • Change in gamma-CEHC
    • Time Frame: Baseline, 30 hours after dosing initial dosing
  • Change in 5-NO-gamma tocopherol
    • Time Frame: Baseline, 30 hours after dosing initial dosing
  • Number of Participants With Abnormal Laboratory Values and/or Adverse Events That Are Related to Treatment
    • Time Frame: Baseline, 30 hours after initial dosing

Participating in This Clinical Trial

Inclusion Criteria

1. Males and females between 18 and 50 years of age. 2. Vital signs within normal limits on admission to the study: SpO2 > 94%, systolic blood pressure between 150-90 mm Hg, diastolic blood pressure between 100-60 mm Hg, afebrile. Exclusion Criteria:

1. Any chronic medical condition considered by the PI as a contraindication to receiving yT, including significant cardiovascular disease, diabetes requiring medication, chronic renal disease, chronic thyroid disease, kidney disease or coagulation defects. 2. Use of systemic or inhaled steroids. 3. Use of NSAID or ASA within 48 hours of dosing, and inability to withhold these medications for the duration of the study. 4. Use of anticoagulants including warfarin, heparin, clopidogrel or enoxaparin. 5. Diagnosis of anemia or abnormal blood counts at screening 6. Known vagal response to venipuncture 7. Abnormal PT or PTT values at screening. 8. BMI > 35 9. Pregnant or breast feeding women will not be included.

Gender Eligibility: All

Minimum Age: 18 Years

Maximum Age: 50 Years

Are Healthy Volunteers Accepted: Accepts Healthy Volunteers

Investigator Details

  • Lead Sponsor
    • University of North Carolina, Chapel Hill
  • Collaborator
    • National Institute of Environmental Health Sciences (NIEHS)
  • Provider of Information About this Clinical Study
    • Sponsor
  • Overall Official(s)
    • David B. Peden, MD, MS, Principal Investigator, University of North Carolina, Chapel Hill

Citations Reporting on Results

Wiser J, Alexis NE, Jiang Q, Wu W, Robinette C, Roubey R, Peden DB. In vivo gamma-tocopherol supplementation decreases systemic oxidative stress and cytokine responses of human monocytes in normal and asthmatic subjects. Free Radic Biol Med. 2008 Jul 1;45(1):40-9. doi: 10.1016/j.freeradbiomed.2008.03.002. Epub 2008 Mar 12.

Clinical trials entries are delivered from the US National Institutes of Health and are not reviewed separately by this site. Please see the identifier information above for retrieving further details from the government database.

At TrialBulletin.com, we keep tabs on over 200,000 clinical trials in the US and abroad, using medical data supplied directly by the US National Institutes of Health. Please see the About and Contact page for details.