Trial reportInternational journal of environmental research and public health2018
Vitamin D₃ Supplementation Reduces the Symptoms of Upper Respiratory Tract Infection during Winter Training in Vitamin D-Insufficient Taekwondo Athletes: A Randomized Controlled Trial.
Trial report in International journal of environmental research and public health, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
22 citing papers in PubMed, 1 synthesis or guideline pooled it, 45 citations in OpenAlex.
- Select Dietary Supplement Ingredients for Preserving and Protecting the Immune System in Healthy Individuals: A Systematic Review.Nutrients · 2022Pooled it
- Dietary supplements to reduce symptom severity and duration in people with SARS-CoV-2: a double-blind randomised controlled trial.BMJ open · 2023Trial
- Effects of Beetroot Juice Supplementation on Cognitive Function, Aerobic and Anaerobic Performances of Trained Male Taekwondo Athletes: A Pilot Study.International journal of environmental research and public health · 2021Trial
- Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respiratory Infection during Military Training.Medicine and science in sports and exercise · 2021Trial
- The interplay between vitamin D status and exerkine signaling: implications for exercise adaptation in athletes: narrative review.Journal of the International Society of Sports Nutrition · 2026Review
- The association of VDR gene polymorphisms with serum vitamin D levels and injury predisposition in elite athletes of Kazakhstan.European journal of applied physiology · 2026Article
- FokI Polymorphism of theNutrients · 2025Article
- Applications and Benefits of Dietary Supplements in Taekwondo: A Systematic Review.Life (Basel, Switzerland) · 2025Review
- Effects of vitamin DBiology of sport · 2025Article
- Examination of the Cumulative Risk Assessment and Nutritional Profiles among College Ballet Dancers.International journal of environmental research and public health · 2023Article
- Article
- Vitamin D deficiency in athletes: Laboratory, clinical and field integration.Asia-Pacific journal of sports medicine, arthroscopy, rehabilitation and technology · 2022Review
- Competitive Golf: How Longer Courses Are Changing Athletes and Their Approach to the Game.Nutrients · 2022Review
- Article
- Influence of vitamin D supplementation on immune function of healthy aging people: A pilot randomized controlled trial.Frontiers in nutrition · 2022Article
- Respiratory Tract Infections and Antibiotic Resistance: A Protective Role for Vitamin D?Frontiers in nutrition · 2021Review
- Vitamin D Deficiency and Insufficiency Among University Students: Prevalence, Risk Factors, and the Association Between Vitamin D Deficiency and Episodes of Respiratory Tract Infections.Risk management and healthcare policy · 2021Article
- The Role of Vitamin D in Combination Treatment for Patients With Rheumatoid Arthritis.Frontiers in medicine · 2020Article
- Vitamin D Update.Current dermatology reports · 2020Review
- Effects of calcitriol on oxidative burst, phagocytic function, and leukocyte cytokine production in shelter dogs.Canine medicine and genetics · 2020Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Vitamin D insufficiency may be associated with increased risk of upper respiratory tract infection (URTI) in athletes. This study examined the effects of vitamin D₃ supplementation on salivary immune functions and symptoms of URTI in vitamin D-insufficient taekwondo athletes. Twenty-five male taekwondo athletes, aged 19⁻22 years with vitamin D insufficiency [serum 25-hydroxyvitamin-D concentrations (25(OH)D, 31.3 ± 1.39 nmol/L)], participated in this study. They were randomized to receive 5000 IU/day of vitamin D₃ (
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.