The Efficacy of Vitamin D Supplementation to Sustain Performance Outcomes (NCT07654777)
Assessment of the Efficacy of Vitamin D Supplementation to Sustain Performance of Military-Relevant Laboratory Tasks Under Acutely Stressed Conditions: A Randomized, Double-Blind, Placebo-Controlled Study
🩺 Plain-English Summary (8th-Grade Level)
The goal of this clinical trial is to find out if vitamin D supplements help healthy adults maintain their cognitive and simple physical task performance and emotional state during highly stressful situations. The main question it aims to answer is: \- Does vitamin D help maintain cognitive and physical task performance and emotional state during highly stressful situations? Researchers will compare vitamin D to placebo (a look-alike tablet that contains no active ingredients) to see if vitamin D better maintain cognitive and physical task performance and emotional state during highly stressful situations. Participants will: * Take vitamin D or placebo tablets daily for 8 weeks. * Perform cognitive and simple physical tasks and rate their emotional state under highly stressful situations. * Wear a stress belt that delivers mild electric shocks 1 - 5 times while participants are performing laboratory tasks. * Wear a wristwatch-shaped activity monitor for 9 weeks. * Visit the laboratory 5 times.
Who can join: Review the eligibility criteria below.
Location: Sleep Research Center (SRC), Walter Reed Army Institute of Research (WRAIR) — Silver Spring, Maryland
Age range: 18 Years to 40 Years
🧪 Interventions in This Study
📋 "Do I Qualify?" — 1-Minute Self Screener
Instant ChecklistFull eligibility criteria are available on the official NIH protocol. View the criteria ↗
📍 All Participating Trial Locations (1 Sites)
- Sleep Research Center (SRC), Walter Reed Army Institute of Research (WRAIR) — Silver Spring, Maryland
📞 Contact the Study Coordinator
Phone: (301) 319-9287
Email: ihori.kobayashi.ctr@health.mil
Coordinator details come directly from the registered NIH protocol. Confirm the study is still recruiting before traveling.
💰 Cost, Insurance & Patient Rights
- 100% Free Items: The investigational treatment and protocol-required procedures are supplied at zero cost by the sponsor.
- Routine Patient Care: Under federal law (ACA § 2709) and many state statutes, routine care costs are covered during participation.
- Voluntary Participation: You may withdraw at any time without affecting your standard medical care.
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💡 How to Participate
- Check the checklist above to see if you may qualify.
- Contact the study coordinator using the phone/email above.
- Ask about the visit schedule, what is covered at no cost, and any travel support.
- Confirm with your own doctor before making a decision.