Treatment
Vitamin D clinical trials
We’re tracking 123 recruiting studies that include Vitamin D, each written for real people, not researchers, below.
Recruiting studies
- NCT04987073Recruiting
Vitamin D type added for CYP24A1 vitamin D deficiency
This study tests a vitamin D-like medicine for people with a specific genetic cause of low active vitamin D (CYP24A1 deficiency). If you have the right gene change, it may help your body use vitamin D more normally.
Caen, NormandyAges 18 years+ - NCT05846880RecruitingEarly Phase 1
Vitamin D3 supplement for people with multiple myeloma
This early-phase study tests whether taking a Vitamin D3 supplement can be safe and helpful for people with symptomatic multiple myeloma. It may help researchers understand how Vitamin D affects the disease and how patients tolerate treatment.
Augusta, GeorgiaAges 18 years+ - NCT07305519Recruiting
Can supplements prevent early birth for short cervix?
This study tests if taking a combination of magnesium, a natural supplement (palmitoylethanolamide), hyaluronic acid, and vitamins B6 and D can help prevent preterm birth in women with a shorter-than-ideal cervix.
Rome, RMAges 18 years+ - NCT07670611RecruitingPhase 4
Vitamin D2 alone or with calcitriol for children with liver disease
This trial compares two types of vitamin D—one is plain vitamin D2, the other is vitamin D2 plus a more active form (calcitriol)—to see which works better for children with liver problems and low vitamin D levels.
BangkokAges Up to 18 years - NCT03621553RecruitingPhase 4
Vitamin D balance study in people with sarcoidosis
This Phase 4 study looks at how your body keeps vitamin D levels balanced in sarcoidosis. It may help researchers understand what affects calcium and vitamin D in sarcoidosis, and guide safer care.
Dallas, TexasAges 21 years+ - 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 - NCT07579078Enrolling by invitation
Vitamin D and Brain Activity in Women With Depression
This study tests whether vitamin D supplements can improve brain wave patterns in women diagnosed with depression who have low vitamin D levels. Researchers will measure brain activity using EEG (a non-invasive test that records electrical signals from the brain) before and after vitamin D treatment.
DhakaAges 20–40 - NCT07300332Recruiting
Exercise training and vitamin D study
This trial tests whether exercise affects how your body uses vitamin D. It might help if you have a higher BMI and do not take certain medications or supplements.
Trikala, KaryesAges 35–50 - NCT06481111Recruiting
Vitamin D treatment registry at San Raffaele
This study is tracking men and women of any age who are taking vitamin D supplements. It aims to learn more about how vitamin D treatment works in real life.
MilanAges 18 years+ - NCT04331639Recruiting
High-dose vitamin D for kids with IBD on biologic therapy
This trial studies whether giving a higher dose of vitamin D3 helps children and teens with inflammatory bowel disease (Crohn’s or ulcerative colitis) who have low vitamin D levels. Participants are already on biologic medicines and will be treated while monitoring blood (and safety) related to vitamin D.
Boston, MassachusettsAges 5–25 - NCT07684404Recruiting
Vitamin D for dental implant success
This trial tests if taking vitamin D improves how well dental implants bond with the jawbone in people with low vitamin D levels. It may help strengthen the implant integration.
Cairo, New CairoAges 20–60 - NCT06450925RecruitingPhase 2
Vitamin A supplements for donor stem cell transplant patients
This study tests whether giving extra vitamin A to adults receiving donor stem cell transplants can help improve outcomes. It is for patients whose vitamin A levels are not high and who can take it by mouth.
Tampa, FloridaAges Any age - NCT07381998Enrolling by invitation
Effects of total thyroid removal on parathyroid function and quality of life
This study looks at how completely removing the thyroid gland affects the nearby parathyroid glands (which control calcium) and your overall quality of life. If you're having a total thyroid removal and meet a few health conditions, you may be able to join.
Aarhus, Central JutlandAges 18 years+ - NCT06847373Recruiting
Vitamin D for teens with obesity
This study is testing whether vitamin D supplements can help teens with obesity. It is open to participants aged 10 to 18 who live in Mexico City and have obesity based on their BMI.
MéxicoAges 10–18 - NCT07458815Recruiting
Vitamin D for stroke recovery after brain bleed
This trial tests whether vitamin D supplements can help people recover after a specific type of stroke (intracerebral hemorrhage). It is for adults who had a moderate-sized bleed in the upper part of the brain within the last 4 days and were otherwise independent before the stroke.
Hong KongAges 18–90 - NCT07491965Recruiting
Vitamin D and Benign Paroxysmal Positional Vertigo (BPPV)
This study looks at whether people with BPPV (a type of vertigo triggered by head movement) have lower vitamin D levels than those who don't have vertigo. Your participation may help clarify if vitamin D plays a role in BPPV.
SohagAges Any age - NCT06642441Recruiting
Vitamin D for reducing chemotherapy side effects in breast cancer
This trial tests whether taking vitamin D supplements can reduce side effects from chemotherapy in people with breast cancer. It is for patients with low vitamin D levels who are about to start their first chemotherapy treatment.
Xining, QinghaiAges 18–80 - NCT04721899Recruiting
Vitamin D study to improve uterine lining for pregnancy
This trial tests whether taking vitamin D can improve the uterine lining’s readiness for pregnancy in women who struggle to conceive. It compares different groups of infertile patients to see who may benefit and to monitor for safety.
Hong KongAges 18–40 - NCT06571344Recruiting
Vitamin D in dialysis patients
This trial checks if measuring vitamin D in dialysis patients can lead to better treatment, then gives vitamin D supplements to those who are low. It may help improve your bone and heart health.
GdanskAges 18 years+ - NCT06708741RecruitingPhase 3
Vitamin D maintenance after surgery
This trial tests whether taking vitamin D supplements after surgery can help maintain healthy vitamin D levels. It may be a good fit if you are between 21 and 65, had surgery, and are willing to take vitamin D and have your levels checked.
Singapore, SingaporeAges 21–65 - NCT05877846Recruiting
Personalized care to improve physical function in older adults
This study looks at precision (personalized) approaches to help older adults improve physical function. It may include giving a specific supplement depending on lab results, and it requires regular study visits and ability to complete procedures.
Chapel Hill, North CarolinaAges 65–85 - 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 - NCT06045351RecruitingPhase 1
Vitamin D shots for women with PCOS and low vitamin D
This trial tests whether vitamin D injections can help females with polycystic ovary syndrome (PCOS) who also have low vitamin D levels. Participants will receive the injection and be monitored for changes in their condition.
Karachi, SindhAges 18–45 - NCT04179370Recruiting
Vitamin D and health in British African-Caribbean women
This study looks at vitamin D levels and how they relate to overall health in British African-Caribbean women. It may help researchers understand whether vitamin D support or lifestyle changes could benefit this group.
GuildfordAges 18 years+
Common questions
- Are there clinical trials studying Vitamin D?
- Yes. Clin2 currently lists 123 recruiting studies that include Vitamin D, drawn from the U.S. registry and rewritten for real people so you can see what each is testing and who it's for.
- How do I know if I qualify for a Vitamin D trial?
- Each study lists its own eligibility criteria — rules about condition, age, and prior treatments. On every Clin2 trial page we explain these in plain language and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Is Vitamin D an approved treatment?
- A drug being studied in a trial may be investigational (still being tested) or already approved and being studied for a new use. Each study page explains what phase it's in. Clin2 does not provide medical advice — talk with your doctor about whether Vitamin D or a specific trial is right for you.
Related treatments
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. A drug appearing here is being studied in a trial and may be investigational. Talk with your doctor about whether a specific treatment or trial is right for you.