Clinical trials
Vitamin D Deficiency clinical trials
Below are recruiting vitamin d deficiency clinical trials, each written for real people, not researchers. We’re tracking 39 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT06745817Enrolling by invitation
Nutrition study for women of childbearing age
This study looks at how well women in their reproductive years get enough nutrients from their diet. It will compare the nutrition of women who eat a regular diet, a vegetarian diet, or a vegan diet.
LjubljanaAges 20–49 - NCT05795504Enrolling by invitation
Exercise program to improve calcium and vitamin D levels
This trial compares two exercise routines—resistance training versus high-intensity interval training (HIIT)—to see which better improves calcium intake and vitamin D levels in women. You may be able to join if you are 40–45, have low vitamin D, and are not using hormone therapy.
GizaAges 40–45 - NCT06172764RecruitingPhase 4
Vitamin D for early cavities: a saliva study
This study tests whether vitamin D supplements can help improve the health of your mouth by looking at changes in saliva and the bacteria that cause cavities. If you have early cavities and low vitamin D, you may be able to join.
Karachi, SindhAges 12–50 - NCT03188796RecruitingPhase 3
High-dose vitamin D for ICU patients with low vitamin D
This trial tests whether giving a high dose of vitamin D3 can reduce death within 28 days for critically ill adults in the ICU who have very low vitamin D levels. It may help by correcting vitamin D deficiency, which the study team thinks could affect outcomes in serious illness.
EnzenbachAges 18–100 - 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+ - NCT06842368Recruiting
Immediate implants with vitamin D or hyaluronic acid bone graft
This study compares two types of bone graft materials mixed with either vitamin D or hyaluronic acid for dental implants placed immediately after a tooth is removed. It aims to see which helps the implant heal better.
CairoAges 18–60 - NCT07681115Recruiting
Vitamin D and pregnancy after frozen embryo transfer
This study looks at how vitamin D levels affect pregnancy success after a frozen embryo transfer. If you are a woman planning this procedure at Fakih IVF, you may be able to join to help researchers understand the link between vitamin D and pregnancy outcomes.
Abu DhabiAges 18–40 - NCT07115342Recruiting
Probiotics and vitamin D for hay fever relief
This study tests whether taking a combination of probiotics (good bacteria) and vitamin D can help reduce hay fever symptoms. It may be a good option if your vitamin D is low and you haven't used probiotics recently.
Tanta, Gharbia GovernorateAges 18–65 - NCT07084597Recruiting
Vitamin D3 for Heart Health in Parkinson's Men
This study tests whether taking vitamin D3 supplements can improve the nerve function that controls your heartbeat in men with Parkinson's disease who have low vitamin D levels. If you have mild to moderate Parkinson's and are on levodopa, this trial may help understand if vitamin D can support your heart health.
Dhaka, ShahbagAges 51–70 - NCT07647198RecruitingPhase 2
Green tea extract and vitamin D to prevent fibroid return
This study tests whether two natural supplements—green tea extract (EGCG) and vitamin D—can help prevent uterine fibroids from coming back after treatment. You would take these supplements for 12 months while avoiding pregnancy.
Abu Dhabi, United Arab Emirates (uae)Ages 18 years+ - NCT07763977Enrolling by invitation
Vitamin D and iron study for obsessive-compulsive disorder
This study tests whether vitamin D and iron levels affect brain function linked to self-control in people with OCD. It may help find new ways to improve treatment.
Guangzhou, GuangdongAges 14–45 - NCT07757477Recruiting
Sunlight for vitamin D in kids with cerebral palsy
This study tests whether sunlight exposure can help raise vitamin D levels in young children with cerebral palsy. It aims to see if more sunlight can improve their health and well-being.
Jakarta Pusat, DKI JakartaAges 1–5 - 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 - 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+ - NCT06822062Recruiting
Do chitin and vitamin C help iron absorption from insects?
This study tests whether taking chitin (found in insect shells) and vitamin C together improves how well your body absorbs iron from a meal containing insect powder. It may help women with low iron stores find new ways to boost iron levels naturally.
Zurich, Canton of ZurichAges 18–45
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Common questions
- Are there clinical trials for vitamin d deficiency?
- Yes. Clin2 currently lists 39 recruiting vitamin d deficiency 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 deficiency 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 deficiency 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.