Clinical trials
Vitamin D clinical trials
Below are recruiting vitamin d clinical trials, each written for real people, not researchers. We’re tracking 119 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- 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 - NCT07296471Recruiting
Vitamin D and Bone Health Study
This study is looking at how vitamin D levels relate to bone health and overall health markers in people with and without osteoporosis. It aims to find better ways to understand and treat bone loss.
Yichang, HubeiAges 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+ - NCT07222111Recruiting
Dried plums for immune health in postmenopausal women
This study tests whether eating dried plums every day can improve immune function in women after menopause. Participants will eat dried plums and provide stool samples at four times during the study.
Indianapolis, IndianaAges 60–75 - 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 - NCT06087783Recruiting
Nutrition supplement study for gynecologic cancer patients on chemo
This study tests whether a special protein, leucine, and vitamin D drink can help women with gynecologic cancer stay stronger during platinum-based chemotherapy. If you're starting your first chemo cycle and can do most daily activities, you may be eligible.
Pavia, ItalyAges 18 years+ - NCT07153302Recruiting
Can almonds help heal broken leg bones?
This study tests if eating almonds can help femur (thigh) or tibia (shin) fractures heal faster. If you have a fresh leg break and are 18 to 55, you may be able to join.
KarachiAges 18–55 - 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 - 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 - 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+ - 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 - 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 - 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+ - 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 - 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+ - 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 - NCT05925309Recruiting
Oral antibiotics to prevent bile duct inflammation after Kasai surgery
This trial studies whether giving oral antibiotics before symptoms start can lower the chance of cholangitis (bile duct infection/inflammation) after Kasai portoenterostomy. It may help protect your child’s bile flow and reduce painful or serious infections after surgery.
Shanghai, Shanghai MunicipalityAges 2 weeks–3 months - NCT06508099RecruitingPhase 2
Vitamin A and D supplements after stem cell transplant
This trial tests whether taking vitamin A and D after a stem cell transplant can help improve recovery. It is for people with certain blood cancers who have a matched donor and are in remission or have low disease activity.
Saint PetersburgAges 18 years+ - NCT07256769Recruiting
Vitamin K, D-chiro inositol and α-lactalbumin for bone health
This trial tests a combination of vitamin K, D-chiro inositol, and α-lactalbumin to help maintain bone strength in women with breast cancer who are on hormone therapy and have low vitamin D. It aims to see if these supplements improve bone health while you take a standard bone medication (alendronate).
Latina, ItalyAges 35–70 - NCT06327581Recruiting
Microneedling with creams for patchy hair loss
This trial tests if microneedling with either lactic acid, vitamin D3, or a steroid cream helps regrow hair in people with patchy alopecia areata (small bald spots).
ZagazigAges 16 years+ - NCT02966665RecruitingPhase 1
Testing blood vessel function in people of different health conditions
This early study measures how well your blood vessels work using tests that may include MRI. It compares healthy people with people who have conditions like COPD, pulmonary arterial hypertension, heart failure, or high blood pressure, to better understand “vascular function” in health and disease.
Salt Lake City, UtahAges 18 years+
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Common questions
- Are there clinical trials for vitamin d?
- Yes. Clin2 currently lists 119 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.