Clinical trials
Vitamin D clinical trials
Below are recruiting vitamin d clinical trials, each written for real people, not researchers. We’re tracking 125 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT03008525Recruiting
Testing vitamin D levels in body fat tissue during surgery
This study measures vitamin D (and related forms) in fat tissue samples taken during surgery. It compares people with obesity to people without obesity to understand how vitamin D is handled in fat.
MarseilleAges 18–65 - NCT03516968RecruitingPhase 3
Monthly vs daily vitamin D for obese children
This study compares taking vitamin D as a monthly dose versus a daily dose in children with low vitamin D levels. It aims to correct the vitamin D deficiency and see which schedule works best and is safe.
BronAges 5–18 - NCT03824106Recruiting
Frailty rehab program for older adults at YMCA
This trial studies a rehabilitation (rehab) program to help older adults who are at risk of losing mobility and independence. You may be offered group-based rehab at the YMCA if you meet age, mobility, safety, and participation requirements.
Hamilton, OntarioAges 65 years+ - NCT04159675Recruiting
Burosumab and vitamin D for kids needing skull surgery
This study tests whether burosumab and vitamin D affect bone cells before and around the time of craniosynostosis surgery in children. It may help researchers understand treatment options for rare calcium and phosphate bone disorders that can affect skull growth.
BronAges 4 months–18 years - NCT04615988Recruiting
Vitamin D levels and hormone side effects from immune cancer therapy
This study looks at whether your blood vitamin D level is linked to hormone-related side effects caused by immune checkpoint cancer drugs. It may help doctors better predict who is at risk and how to monitor patients during treatment.
New York, New YorkAges 18 years+ - NCT04775381RecruitingPhase 3
Vitamin D before thyroid surgery to prevent low calcium
This study tests whether taking vitamin D (cholecalciferol) before a total thyroid removal can reduce the risk of developing low blood calcium afterward. If you’re having your thyroid removed, the results may help prevent symptoms like tingling, cramps, or spasms caused by low calcium.
AuxerreAges 18 years+ - NCT04821544Recruiting
Study of stress in new mothers and how it affects breastmilk
This study looks at how stress in new mothers may change their breastmilk and how that relates to newborn health outcomes. It is specifically recruiting mothers with babies in certain NICUs.
Coeur d'Alene, IdahoAges 18–50 - NCT05043116RecruitingPhase 2
Vitamin D for preventing asthma-like flare-ups in young children
This study tests whether a high-dose vitamin D supplement can help preschool children have fewer acute asthma-like symptoms (coughing, wheezing, or trouble breathing) that require hospital care. It may help by supporting the immune and airway system, but you can only join if the child meets several safety and treatment criteria.
Gentofte Municipality, GentofteAges 1 year–5.9 years - NCT05045066RecruitingEarly Phase 1
Vitamin D treatment study for Black men with prostate cancer
This early-phase study looks at how vitamin D replacement affects the immune system in Black/African American men with prostate cancer. It’s testing whether bringing vitamin D levels into a healthier range changes immune signals that may matter for cancer health.
Scottsdale, ArizonaAges 18 years+ - NCT05787808Recruiting
Preventive treatment for people with early bone loss
This trial studies a preventive treatment for people over 55 who have early bone thinning (called osteopenia). If you qualify, it may help reduce the risk of getting osteoporosis and related fractures.
Skjetten, AkershusAges 55–85 - NCT05817617Recruiting
Vitamin D use in head and neck cancer
This study looks at how taking vitamin D may affect side effects (toxicity) and outcomes in people with locally advanced head and neck squamous cell cancer. It may help improve comfort during treatment and track whether vitamin D changes prognosis.
Barletta, BATAges 18 years+ - NCT06081387Recruiting
Exercise and vitamin D for type 2 diabetes
This study tests whether adding aerobic and resistance exercise to your routine helps manage type 2 diabetes better when you already take metformin, an SGLT2 inhibitor, and possibly vitamin D. You would be assigned either to an exercise program or to continue your usual care.
BarcelonaAges 40 years+ - NCT06570889RecruitingPhase 3
Vitamin D in pregnancy to prevent early childhood asthma
This trial tests if taking extra vitamin D during pregnancy can prevent asthma in young children. It is for pregnant women in Denmark who already have certain healthy fat levels in their blood.
Gentofte MunicipalityAges 18–45 - NCT06765265RecruitingPhase 4
Comparing two statins' effect on vitamin D after heart attack
This study compares two common statins (atorvastatin and rosuvastatin) to see how they affect vitamin D levels in people who have recently had a heart attack or unstable angina. It may help doctors choose the best statin for your heart and vitamin D health.
Lahore, Punjab ProvinceAges 18–65 - NCT06830187Recruiting
Bone density, vitamin D, and hearing loss in otosclerosis
This study looks at how bone density and vitamin D levels relate to hearing loss in people with otosclerosis, a condition where extra bone growth in the ear causes hearing problems. It may help doctors understand why some people lose more hearing than others.
AnkaraAges 18 years+ - NCT06909409Recruiting
Vitamin D and lung immune cells in lung fibrosis
This study looks at how vitamin D affects immune cells in the lungs of people with a lung scarring condition called idiopathic pulmonary fibrosis (IPF) or other similar lung diseases. It tests if vitamin D levels are linked to how these cells work.
Aarhus NAges 18 years+ - NCT07105163Recruiting
Bisphosphonate and supplement adherence in postmenopausal osteoporosis
This trial looks at how well women with postmenopausal osteoporosis follow their treatment plan, which includes a bisphosphonate taken once a week or once a month along with daily calcium and vitamin D supplements. The goal is to understand patterns that may help improve care.
Santiago de Compostela, A coruñaAges Any age - NCT07120997Recruiting
Prunes to prevent bone loss during perimenopause
This study tests whether eating prunes every day can help prevent bone loss in women going through perimenopause. If you are between 44 and 55, not severely obese, and have irregular periods, you may be able to join.
University Park, PennsylvaniaAges 44–55 - NCT07130305Recruiting
Vibration therapy and vitamin D for FMF in teens
This trial tests if adding whole-body vibration to vitamin D supplements can improve symptoms in adolescent girls with Familial Mediterranean Fever (FMF). It aims to find a simple, non-drug way to help manage the condition.
Giza, DokkiAges 13–17 - NCT07366086RecruitingPhase 3
Long-term safety of romosozumab for osteogenesis imperfecta in children
This study follows children who previously received romosozumab in an earlier trial to check their long-term safety. It helps understand if the treatment's benefits last safely over time.
Indianapolis, IndianaAges 5–19 - NCT07369063RecruitingPhase 2
Vitamin D for pediatric Graves' disease
This study tests whether adding vitamin D therapy to the usual Graves' disease treatment (methimazole) can improve thyroid function and lower antibody levels in children. If your child is between 9 and 17 and recently diagnosed, they may be able to participate.
New Hyde Park, New YorkAges 9–17 - NCT07479290RecruitingPhase 1
Vitamin D gel to speed up tooth movement after extraction
This trial tests whether applying vitamin D near the extraction site can speed up how quickly your canine teeth move into the gap after premolars are removed. It might help shorten your orthodontic treatment.
Islamabad, FederalAges 13 years+ - NCT07534852Recruiting
Nutrition and exercise support for colon cancer surgery patients
This study tests whether nutrition support and exercise help patients with early-stage colon cancer recover better after surgery. Researchers will provide dietary guidance and a supervised exercise program tailored to your needs.
Málaga, MalagaAges 18–75 - NCT07651709Recruiting
Bone Health During Pregnancy in Women With Epilepsy
This study looks at how epilepsy and epilepsy medications affect bone health during pregnancy and after delivery. Researchers want to understand how to keep bones strong while you're pregnant and taking seizure medications, which can sometimes weaken bones.
ZhejiangAges 18 years+
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Common questions
- Are there clinical trials for vitamin d?
- Yes. Clin2 currently lists 125 recruiting vitamin d studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a vitamin d trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a vitamin d trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.