Bioavailability of Folic Acid Fortified Bread

Overview

Folic acid is the synthetic form of vitamin folate. Because of its high stability and bioavailability, it is the form of folate added to bread in Canada to reduce birth defects. There are health concerns about long-term folic acid consumption. Another form of folate, L-5-methyltetrahydrofolic acid (L-5-MTHF) has become available which does not have these health concerns. Unfortunately L-5-MTHF is not as stable as folic acid, but the investigators have developed a method to stabilize L-5-MTHF in food. The investigators plan to conduct a randomized trial to compare the bioavailability of bread fortified with L-5-MTHF versus folic acid. The investigators hypothesize that bread fortified with L-5-MTHF will increase red cell folate over 16 weeks to the same extent as bread fortified with equimolar folic acid.

Full Title of Study: “Bioavailability of Folic Acid and L-5-methyltetrahydrofolic Acid in Fortified Bread: a Randomized Placebo-controlled Trial”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Randomized
    • Intervention Model: Parallel Assignment
    • Masking: Double (Participant, Investigator)
  • Study Primary Completion Date: December 2012

Detailed Description

See above.

Interventions

  • Dietary Supplement: Folic acid
    • One roll/bun per day fortified with 400 µg of folic acid
  • Dietary Supplement: L-5-MTHF
    • One roll/bun per day fortified with 452 µg of L-5-MTHF
  • Other: Placebo
    • Placebo contains no folic acids

Arms, Groups and Cohorts

  • Active Comparator: Folic acid
  • Experimental: L-5-MTHF
  • Placebo Comparator: Placebo

Clinical Trial Outcome Measures

Primary Measures

  • red blood cell folate concentration at three time points
    • Time Frame: baseline, 8th week, 16th week
    • We will take one blood sample at baseline, 8th and 16th week. For each blood sample, we will measure the red blood cell folate concentration as our primary outcome measure. We will record the changes in the folate concentrations.

Participating in This Clinical Trial

Inclusion Criteria

  • 18-45 years – Not taking a folic acid containing supplement Exclusion Criteria:

  • Adults who have medical conditions such as diabetes, asthma, cancer, cardiovascular disease, high blood pressure, celiac disease, or psychiatric illness – Adults who are taking medications known to interfere with folate metabolism (i.e. phenytoin, sulphasalazine, methotrexate) – Adults with wheat, milk allergy or lactose intolerance – Adults with known B12 deficiency – Adults who consume more than 1 alcoholic drink/day on average (1 drink=12 oz beer, 5 oz wine or 1.5 oz spirits) – Women have been pregnant during the year previous – Women planning a pregnancy in the next year – Women who believe they may become pregnant during the study – Women who have had a known previous neural tube defect affected pregnancy – Adults who are unable to provide informed consent

Gender Eligibility: All

Minimum Age: 18 Years

Maximum Age: 45 Years

Are Healthy Volunteers Accepted: Accepts Healthy Volunteers

Investigator Details

  • Lead Sponsor
    • University of British Columbia
  • Provider of Information About this Clinical Study
    • Sponsor
  • Overall Official(s)
    • Tim Green, PhD, Principal Investigator, University of British Columbia

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