Treatment
Vitamin A clinical trials
We’re tracking 274 recruiting studies that include Vitamin A, each written for real people, not researchers, below.
Recruiting studies
- NCT06943443Enrolling by invitation
Vitamin D and expander treatment for teens
This trial looks at whether vitamin D levels affect how well a special expander (MARPE) works to fix a narrow upper jaw in teens. If you are 15–18 and have a narrow upper jaw, you may be able to join.
Konya, MeramAges 16–18 - NCT06061848RecruitingPhase 2/Phase 3
Grass pollen allergy shot with vitamin D
This study tests if adding vitamin D to a new type of allergy shot (ILIT) works better than standard allergy drops for grass pollen allergy. It may help if you have moderate to severe seasonal allergy symptoms.
LundAges 18–60 - NCT07046845Recruiting
Prenatal Vitamin Study: Special vs. Generic for Moms with Food Insecurity
This study compares a special prenatal vitamin (Perelel) with a standard generic prenatal vitamin. It looks at how each affects the health of moms and babies, especially for those who have trouble getting enough nutritious food.
Pittsburgh, PennsylvaniaAges 14 years+ - 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 - NCT07515664RecruitingPhase 4
Vitamin K to Manage Blood Thinning Before Surgery
This study tests whether vitamin K can safely help manage warfarin (a blood thinner) before surgery. If you take warfarin at home and need an upcoming surgery, this trial may help you avoid hospitalization for blood-thinning adjustments.
Ann Arbor, MichiganAges 18 years+ - NCT06791044Recruiting
Vitamin D and bone health in neurological patients
This trial looks at how vitamin D levels relate to bone strength and daily function in people with neurological disorders. If you have a neurological condition or are healthy, you may join to help understand how vitamin D affects bone health.
Nea Liosia, AthensAges 20–85 - NCT07665671RecruitingPhase 4
Vitamin B12 absorption study in older adults
This study looks at how well your body absorbs vitamin B12. You will receive a B12 supplement and have your blood tested. It is for healthy adults aged 50 and older who are not taking B12 supplements.
Brisbane, QueenslandAges 50 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+ - 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 - NCT04150042RecruitingPhase 1
Test of chemotherapy plus your own stem cells for metastatic cancer
This Phase 1 trial tests a treatment approach using standard chemotherapy along with stem cells taken from you to treat metastatic pancreatic or breast cancer. It is mainly designed to check safety and find the best way to give the treatment, and it may offer an option for people whose cancer has spread.
Boston, MassachusettsAges 18 years+ - 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+ - NCT04258488RecruitingPhase 4
Blood thinner pill vs warfarin after mechanical aortic valve
This study compares a blood thinner pill (a factor Xa inhibitor) with warfarin (vitamin K antagonist) in people who have had a mechanical aortic valve replacement. It looks at which option works better and is safer over the long term.
Bucheon-siAges 19 years+ - NCT04442412RecruitingPhase 3
Prednisone and vitamin D before chemo for certain lymphomas
This Phase 3 study tests whether a short “pre-treatment” with prednisone, with or without vitamin D, can improve outcomes when followed by standard lymphoma chemo. It aims to see if adding vitamin D early can help older adults tolerate or benefit from treatment for specific lymphoma types.
Brescia, BSAges 65 years+ - NCT04650880Recruiting
Vitamin D study for irregular periods from PCOS
This trial studies whether taking vitamin D can improve ovulation (the release of an egg) in people with PCOS who have long, irregular menstrual cycles. It may help some participants have more regular ovulation and cycle timing, but you would be monitored with vaginal ultrasound and blood tests.
Hong KongAges 18–40 - NCT05018221RecruitingPhase 3
Testing better treatment information for calciphylaxis ulcers
This Phase 3 study is for adults on regular dialysis who have a new calciphylaxis ulcer. It tests a better way to give and use treatment guidance so ulcers may improve with clearer, more consistent care.
Concord, New South WalesAges 18 years+ - NCT05067998Recruiting
Natural medicine and vitamin IV study for overall health
This study looks at whether natural medicine, vitamin IV fluids, and supplements can help people maintain good health. There don’t appear to be specific eligibility limits listed, so many people may be able to join, but you’d still need screening by the study team.
Dover, DelawareAges 21–80 - NCT05174611RecruitingPhase 2
Vitamin D to strengthen the thigh after ACL surgery
This Phase 2 study tests whether taking vitamin D can improve thigh (quadriceps) muscle strength after ACL reconstruction. It targets people with low vitamin D levels that persist after surgery and weaker thigh strength on the injured side.
Hong KongAges 18–40 - NCT05555576Recruiting
Vitamin C to reduce opioid use after an ER visit
This trial tests whether taking vitamin C after an emergency room visit for a new, short-term muscle or joint pain can lower how many opioid pain pills you use. It may help by reducing opioid consumption while you recover.
Montreal, QuebecAges 18 years+ - NCT05646394Recruiting
Registry for blood-clot prevention plans in arterial antiphospholipid syndrome
This study keeps a registry to follow people with antiphospholipid syndrome (APS) who have had arterial blood clots (like stroke). It collects information about the treatment approach your clinician chooses to see how different antithrombotic regimens may perform and be tolerated.
Buenos Aires, Buenos Aires F.D.Ages 18 years+ - NCT05667090Recruiting
High-dose vitamin D3 to ease chronic pain in dialysis patients
This study tests whether taking a very high dose of vitamin D3 can reduce moderate to severe chronic pain in people on hemodialysis. It may help by improving vitamin D-related pathways that could affect pain, but you must also meet specific health and testing requirements.
TaipeiAges 20 years+ - NCT05702398RecruitingEarly Phase 1
Vitamin A and niacinamide for high-risk skin cancer
This early trial tests whether adding vitamin A and niacinamide (a form of vitamin B3) can help people with a history of certain skin cancers reduce new disease. It is designed for adults with specific prior skin cancer or skin lesion treatment patterns.
Providence, Rhode IslandAges 18 years+ - NCT05771181RecruitingPhase 2
Test vitamin E plus two cancer drugs for metastatic colon cancer
This trial tests whether adding vitamin E to two cancer medicines (fruityquintinib and tislelizumab) can work better in people with metastatic colorectal cancer that is mismatch-repair stable (MSS). It may help if your cancer has grown despite standard treatment, and you can meet the study’s safety and blood/organ requirements.
Shanghai, Shanghai MunicipalityAges 18 years+ - NCT05837104RecruitingPhase 2
Magnesium and vitamin B6 for early bipolar depression
This Phase 2 trial tests whether magnesium plus vitamin B6 can reduce depressive symptoms in people who are newly diagnosed with bipolar I disorder. It also checks for safety over a short, 4-week treatment period.
Belmont, MassachusettsAges 18–50 - NCT05838716RecruitingPhase 3
Vitamin D During Hormone Therapy for Prostate Cancer
This trial studies whether taking vitamin D while you are on prostate hormone therapy (ADT) affects your health outcomes. It may help by keeping vitamin D levels in a safe range during treatment.
Newark, DelawareAges 50 years+
Common questions
- Are there clinical trials studying Vitamin A?
- Yes. Clin2 currently lists 274 recruiting studies that include Vitamin A, 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 A 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 A 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 A 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.