Safety Study of a Vitamin E Supplement in Normal Volunteers and Those With Both Allergy and Asthma


Gamma tocopherol (gt) is a naturally occurring form of vitamin E that is found in many foods, and is also commercially available as a vitamin supplement. The purpose of this Phase 1 research study is to see if two doses of gt, 600mg and 1200mg, are safe (do not cause gastrointestinal distress or other problems), and can cause changes in your blood levels of gt and other antioxidants. This study will also examine if there is a difference in response between asthmatic and non-asthmatic adults when taking the same dose of gt. Phase 1 research studies like this one are not intended to be a treatment, but are a scientific investigation.

Full Title of Study: “Comparison of Gamma-tocopherol Supplementation in Allergic Asthmatics and Normal Volunteers”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Non-Randomized
    • Intervention Model: Single Group Assignment
    • Primary Purpose: Screening
    • Masking: None (Open Label)
  • Study Primary Completion Date: June 2007

Detailed Description

This is designed as an open label study of the effect of 600 mg and 1200mg gamma tocopherol (gt), orally administered daily for 8 days, on serum antioxidant levels in asthmatics and healthy volunteers. Each course of gamma tocopherol will be followed by a 7-8 day wash out period and serum testing to ensure that blood levels are back to baseline prior to starting the next course. The gamma tocopherol will be obtained from Yasoo Health Inc and contains 623mg gt per 830 mg gelatin capsule.

Allergy skin testing to a battery of allergens common to the region will be performed to determine the state of atopy both prior to drug administration and after the 8 day course. Allergic volunteers will be asked to abstain from taking any antihistamines during the 3 days prior to the skin testing. Repeat allergy testing will not be performed on subjects unable to hold antihistamines for health reasons, or on non-allergic volunteers who demonstrate no response to baseline testing. Spirometry will be performed to determine the current level of lung function. Subjects will be asked to refrain from taking vitamin supplements, non-steroidal anti-inflammatory medications and other dietary supplements.


  • Drug: Vitamin E supplement rich in gamma tocopherol
    • daily dose of Vitamin E supplement rich in gamma tocopherol

Arms, Groups and Cohorts

  • Experimental: 1
    • Vitamin E supplement rich in gamma tocopherol

Clinical Trial Outcome Measures

Primary Measures

  • serum levels of gamma tocopherol and its metabolites after eight days of supplementation
    • Time Frame: eight days

Secondary Measures

  • latency between the first dose and peak levels of gamma tocopherol
    • Time Frame: levels at points within 24 hours
  • effect of gamma tocopherol supplementation on other antioxidants
    • Time Frame: 8 days
  • effect of supplementation with gamma tocopherol on changes on cell surface marker expression on circulating monocytes and macrophages and on these cells’ response to ex vivo LPS challenge
    • Time Frame: 1-8 days

Participating in This Clinical Trial

Inclusion Criteria

allergic asthmatic cohort

  • Specific allergy to at least one of the following allergen preparations: (House Dust Mite f, House dust mite p, Cockroach, Tree mix, Grass Mix, Weed Mix, Mold Mix 1, Mold Mix 2, Rat, Mouse, Guinea Pig, Rabbit, Cat or Dog) confirmed by positive immediate skin test response.
  • Oxygen saturation of > 94 % at baseline
  • Blood pressure within the following parameters (Systolic between 150 – 90,Diastolic between 100-60 mm Hg)
  • Moderate or severe persistent asthma according to NHLBI definitions including history of one of the following: 1)Episodic wheezing, chest tightness or shortness of breath consistent with asthma occurring at least once a week that may affect activity;2)Asthma symptoms occurring at night or during sleep at least 1 time per week; 3)measured FEV1 or FVC is <80% of predicted; OR 4)physician diagnosed moderate or severe persistent asthma which is currently treated or controlled with maintenance medication including moderate or high dose inhaled corticosteroid, or any dose of inhaled corticosteroid and a long-acting inhaled B2-agonist

Inclusion Criteria- healthy volunteer cohort

  • Oxygen saturation > 94 % at baseline
  • Blood pressure within the following parameters (Systolic between 150 – 90, Diastolic between 100-60 mm Hg)
  • No active allergies
  • No physician diagnosis of asthma since age 6

Exclusion Criteria

  • Any chronic medical condition considered by the PI as a contraindication to receiving gamma tocopherol, including significant cardiovascular disease, diabetes requiring medication, chronic renal disease, chronic thyroid disease, kidney disease or coagulation defects.
  • Use of inhaled steroids, cromolyn or leukotriene inhibitors (montelukast or zafirlukast) which have been used for at least one month are allowed. Patients must be on a stable regimen of maintenance asthma therapy which has not changed in the past month prior to entrance into the study.
  • NSAID or ASA use within 48 hours of beginning the study, and inability to suspended use of these medications during the length of the study.
  • Use of anticoagulants including warfarin, heparin, or clopidogrel.
  • Diagnosis of anemia or abnormal blood counts at screening
  • Pregnancy or nursing a baby. As this is a phase I study, the potential risk to a fetus cannot be justified.
  • Children will not be included in this study as the potential risk to a growing child cannot be justified.
  • Adults age 51 and older are excluded as the potential for concomitant illness in this population increases the risk for confounding the data.
  • Known vagal response to venipuncture
  • Abnormal PT or PTT values at screening

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 Center for Complementary and Integrative Health (NCCIH)
  • Provider of Information About this Clinical Study
    • David Peden, MD/Principal Investigator, UNC Center for Environmental Medicine
  • Overall Official(s)
    • David B Peden, MD, MS, Principal Investigator, University of North Carolina at Chapel Hill, Dept of Pediatrics / Center for Environmental Medicine, Asthma and Lung Biology

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, 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.