Condition

Vitamin D Deficiency clinical trials and research

• 14Clinical trials
• 4NIH research projects
• 1New in 30 days
• 8Countries

Newest Vitamin D Deficiency clinical trials

All recruiting trials (14)

• Vitamin D Supplementation in Children with Irritable Bowel Syndrome

  This study tests whether giving vitamin D to children with IBS and low vitamin D levels can improve their IBS symptoms compared with a placebo.

  Recruiting Aziz Bhatti Shaheed Teaching Hospital · Gujrat, Punjab Province · NCT07914478

• Vitamin D and dental implant osseointegration in adults with deficiency

  This study tests whether giving vitamin D helps improve how well dental implants fuse with bone in adults who are deficient.

  Recruiting Future University in Egypt · Cairo, New Cairo · NCT07684404

• Vitamin D2 with Calcitriol in kids with cholestasis and vitamin D deficiency

  This study tests whether adding calcitriol to vitamin D2 helps children with cholestasis and vitamin D deficiency reach healthier vitamin D levels.

  Recruiting Phase 4 Chulalongkorn University · Bangkok · NCT07670611

• Vitamin D and the body's anti-inflammatory response in gum disease

  This study tests whether vitamin D can modulate the body's anti-inflammatory response in people with gum disease.

  Recruiting Recep Tayyip Erdogan University Training and Research Hospital · Rize · NCT07636733

• Bone Myoregulation and Posture in Vitamin D Deficiency

  This observational study tests whether adults with vitamin D deficiency differ in postural stability and muscle activity from healthy controls during a single-session, noninvasive assessment.

  Recruiting Istanbul Physical Medicine Rehabilitation Training and Research Hospital · Istanbul · NCT07435935

• Adding exercise to vitamin D treatment for diabetic men with erectile dysfunction and low vitamin D.

  This trial will see if adding regular moderate treadmill walking to high‑dose vitamin D replacement helps men with type 2 diabetes, chronic erectile dysfunction, and low vitamin D levels.

  Recruiting Cairo University · Dokki, Giza Governorate · NCT07366970

• Comparison of powdered versus oily vitamin D3 in adults with vitamin D deficiency

  This study will test whether a powdered or an oily vitamin D3 supplement better raises blood vitamin D levels in adults with vitamin D deficiency over eight weeks.

  Recruiting Center for Health Sciences, Serbia · Belgrade · NCT07317830

• Examining the link between CT scans, bone density, and hearing loss in otosclerosis patients

  This study is trying to see if there's a connection between CT scan results, bone density, and hearing loss in adults with otosclerosis compared to those without the condition.

  Recruiting Hacettepe University · Ankara · NCT06830187

• Single high-dose vitamin A given with allogeneic stem cell transplant

  This study tests whether giving one large oral dose of vitamin A to adults having an allogeneic stem cell transplant can lower the chance of moderate-to-severe chronic graft-versus-host disease.

  Recruiting at 3 sites Phase 2 Children's Hospital Medical Center, Cincinnati · Tampa, Florida and 2 other locations · NCT06450925

• Early vitamin D3 supplementation for critically ill patients

  This study tests if giving vitamin D3 early to critically ill patients with low levels can improve their health while they are in the ICU.

  Recruiting National Taiwan University Hospital · Taipei · NCT05937789

• Vitamin D supplementation for patients with triple negative breast cancer

  This study is testing if giving vitamin D to patients with triple negative breast cancer who are low in vitamin D can help them respond better to chemotherapy compared to those who have enough vitamin D.

  Recruiting Phase 2 Wake Forest University Health Sciences · Winston-Salem, North Carolina · NCT04677816

• Vitamin D replacement for adolescent females with PCOS and low vitamin D

  This study will try daily vitamin D (4,000 IU) versus placebo in adolescent females ages 13–21 who have PCOS and low vitamin D to see if it improves hormone and metabolic blood tests over six months.

  Recruiting Yale University · New Haven, Connecticut · NCT04355572

• High dose vitamin D for young patients with inflammatory bowel disease on biologic therapy

  This study is testing if giving high doses of vitamin D to young people with inflammatory bowel disease who are on biologic treatments can improve their bone health and reduce inflammation.

  Recruiting Boston Children's Hospital · Boston, Massachusetts · NCT04331639

• Examining Vitamin D Levels in British African-Caribbean Women

  This study looks at the vitamin D levels in British African-Caribbean women during the colder months to see how diet and sun exposure affect their health.

  Recruiting University of Surrey · Guildford · NCT04179370

NIH-funded research (4)

Early-stage science funded by the US National Institutes of Health. Most of these projects don't enroll patients, but they show what is being worked on.

• Vitamin D, insulin resistance and heart disease

  This work looks at whether low vitamin D in pregnancy and early life causes changes in immune and stem cells that lead to high blood pressure and heart disease later on.

  NIH research Washington University · Saint Louis, United States · NIH-11392902

• Low vitamin D and megalin may raise prostate hormones and aggressive cancer risk in men of African ancestry

  This work looks at whether low vitamin D increases prostate dihydrotestosterone through megalin and raises aggressive prostate cancer risk in men of African ancestry.

  NIH research University of Illinois at Chicago · Chicago, UNITED STATES · NIH-11321621

• Vitamin D deficiency and its impact on prostate cancer in African American men

  This study is looking at how low levels of vitamin D might impact hormone levels in the prostate, especially in African American men who are more likely to develop aggressive prostate cancer, to better understand how a specific protein plays a role in this process.

  NIH research University of Illinois at Chicago · Chicago, UNITED STATES · NIH-11086169

• Investigating how vitamin D deficiency affects blood pressure through immune cells

  This study is looking at how low vitamin D levels might lead to high blood pressure by affecting certain immune cells, and it's especially aimed at helping veterans who often have vitamin D deficiency.

  NIH research St. Louis VA Medical Center · St. Louis, UNITED STATES · NIH-11003729

Related topics

Quick answers

How many Vitamin D Deficiency clinical trials are recruiting right now?

14, as of November 12, 2026. 1 of them was first registered in the last 30 days. We update this list each time we refresh our data from ClinicalTrials.gov.

Where are these trials running?

In 8 countries. The most sites are in United States (4 trials), Turkey (Türkiye) (3 trials), Egypt (2 trials), Pakistan (1 trial), Serbia (1 trial). Each study page lists its sites and which ones are recruiting.

What phases are they in?

Phase 2: 2, 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.

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