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Vitamin D clinical trials and research
As of November 12, 2026, Find a Trial lists 6 Vitamin D clinical trials that are recruiting, at sites in 5 countries (most in Pakistan (2), Mexico (1), Greece (1)). By phase: Phase 4 (1). Every study is explained in plain English. Data from ClinicalTrials.gov and NIH RePORTER, updated November 12, 2026.
- 6Clinical trials
- 5Countries
Newest Vitamin D clinical trials
| Study | Phase | Where | Status | Registered |
|---|---|---|---|---|
| High-intensity interval exercise to improve vitamin D levels in adults with overweight or obesity | — | Trikala, Karyes | Recruiting | Dec 23, 2025 |
| Vitamin D to prevent recurrent pre-eclampsia in pregnant women | Phase 4 | Multan, Punjab Province | Recruiting | Dec 17, 2025 |
| Free vitamin D and steroid metabolism in endocrine and kidney conditions | — | Leuven | Recruiting | Dec 8, 2025 |
| Sweet almonds to help heal femur and tibia shaft fractures | — | Karachi | Recruiting | Sep 3, 2025 |
| Vitamin D supplementation for obese children | — | México | Recruiting | Feb 26, 2025 |
| Combination of natural supplements for treating uterine fibroids | — | Francavilla Fontana, Apulia and 1 other locations | Recruiting | Jul 7, 2022 |
All recruiting trials (6)
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High-intensity interval exercise to improve vitamin D levels in adults with overweight or obesity
This trial will try three hybrid high-intensity interval sessions per week for 12 weeks to see if exercise increases vitamin D (25(OH)D) in adults with overweight or obesity during winter.
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Vitamin D to prevent recurrent pre-eclampsia in pregnant women
This study will test whether taking 4,000 IU of vitamin D during pregnancy lowers the chance of pre-eclampsia returning in women who had it in a prior pregnancy.
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Free vitamin D and steroid metabolism in endocrine and kidney conditions
This project will measure free (unbound) vitamin D and related steroid hormones in adults — including healthy people, pregnant women, and patients with endocrine or kidney disorders — to see how processing differs between groups.
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Sweet almonds to help heal femur and tibia shaft fractures
This test will see if eating sweet almonds helps adults aged 18–55 with trauma-related femur or tibia shaft fractures heal their bones faster and safely.
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Vitamin D supplementation for obese children
This study is testing whether different doses of vitamin D can help obese kids and teens improve their insulin levels and body fat over six months.
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Combination of natural supplements for treating uterine fibroids
This study is testing a mix of natural supplements to see if they can reduce the size of larger uterine fibroids in women who have them.
Related topics
Quick answers
How many Vitamin D clinical trials are recruiting right now?
6, as of November 12, 2026. We update this list each time we refresh our data from ClinicalTrials.gov.
Where are these trials running?
In 5 countries. The most sites are in Pakistan (2 trials), Mexico (1 trial), Greece (1 trial), Italy (1 trial), Belgium (1 trial). Each study page lists its sites and which ones are recruiting.
What phases are they in?
Phase 4: 1. Trials with no phase listed are usually device, behavioural or observational studies.
How do I join one?
Open a study, check the "Is this trial a fit for you?" section, then contact the study team listed on the page. They will ask a few screening questions. Asking is free and does not commit you to anything. Talk it over with your doctor first.
Find the studies that fit you
A list is a starting point. Tell us your situation in your own words and we'll rank the studies that match and explain why. It's free and needs no account.