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
- 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+ - NCT03968393RecruitingPhase 4
Blood thinner to prevent stroke after stress-related irregular heartbeats
This trial tests whether taking a blood thinner can lower the risk of stroke in people who had atrial fibrillation (an irregular heartbeat) that happened temporarily around a stressful illness or surgery. It looks especially at people at higher risk for stroke after that episode.
Los Angeles, CaliforniaAges 55 years+ - NCT03999723RecruitingPhase 2
Test azacitidine with vitamin C to improve DNA changes
This Phase 2 study tests whether combining azacitidine (a standard blood cancer medicine) with vitamin C helps improve disease control by changing DNA activity in high-risk blood cancers. It may be an option if you have certain types of higher-risk MDS, CMML, or low-blast AML and can meet safety requirements.
AalborgAges 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 - NCT04268849RecruitingPhase 3
IV vs oral iron after weight-loss surgery
This Phase 3 study compares taking iron through an IV versus by mouth to treat iron-deficiency anemia after Roux-en-Y gastric bypass or sleeve gastrectomy. The goal is to see which method works better and is safer for improving iron levels and blood counts.
Baltimore, MarylandAges 18 years+ - NCT04516681RecruitingPhase 3
Ascorbic acid plus immunotherapy for spread colorectal cancer
This trial tests whether intravenous vitamin C (ascorbic acid) combined with an immune treatment (adebrelimab) can slow or shrink metastatic colorectal cancer that can’t be removed with surgery. It focuses on tumors that strongly show a specific marker called GLUT3, and aims to see if the combination works better than standard approaches.
Shanhai, Shanghai MunicipalityAges 18–75 - 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 - NCT04871412RecruitingPhase 3
Surgery care program for lung or upper GI cancer patients
This trial tests an “integrative” support program around the time of cancer surgery to see if it improves care and outcomes for people having surgery for lung, stomach, or esophagus cancer. It may help by adding extra structured support during the peri-operative (around-surgery) period.
Ottawa, OntarioAges 18 years+ - NCT04959864Recruiting
Food supplement study for sperm DNA damage in men
This trial tests whether a daily food supplement (with myo-inositol, N-acetyl-cysteine, zinc, and vitamins) can reduce sperm DNA damage. It enrolls men with higher-than-normal sperm DNA fragmentation, and it checks semen health during the study.
ParisAges 20–45 - NCT05005897RecruitingPhase 2/Phase 3
Micronutrient supplements for early infant growth and development
This study tests whether early infant nutrition using specific micronutrients (small amounts of key vitamins and nutrients) can support healthy growth and development. It includes babies whose moms plan to breastfeed for long enough, and it excludes infants with serious health problems.
LillehammerAges 1 month–2 months - 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+ - NCT05333666Recruiting
Checking how blood NOAC levels relate to outcomes
This study looks at whether the amount of a blood thinner (NOAC) in your bloodstream is linked to health outcomes. It may help doctors better understand how to monitor and use these medicines safely.
Taipei, Please SelectAges 20 years+ - NCT05366933RecruitingPhase 1
B-Complex vitamins to protect astronauts during long space missions
This early study tests whether a B-vitamin supplement (called B-Complex) can act as a helpful countermeasure during long stays on the International Space Station. It is only for astronauts assigned to specific 6–12 month missions.
Houston, TexasAges 20–100 - NCT05589064Recruiting
Diet and nutrition program for lingering concussion symptoms
This study tests whether a dietary and nutrition intervention can improve symptoms that linger after a concussion. It may help people whose post-concussion symptoms have lasted a short to medium time (at least 2 weeks).
Moncton, New BrunswickAges 16 years+ - NCT05714917Recruiting
Studying recovery after nerve damage from NOS use
This study looks at how neurological symptoms (like numbness, weakness, unsteadiness, or walking problems) recover after damage caused by NOS use. It may help researchers understand what recovery looks like and what support or treatments could work best.
BirminghamAges 16–40 - 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 - NCT05796401RecruitingPhase 3
Personalized care program for early psychosis outcomes
This trial tests whether a personalized care plan improves day-to-day functioning for people in the early stages of psychosis. It aims to see if adding structured support after a recent diagnosis can help you function better.
BrestAges 15–30 - 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+ - NCT05842382RecruitingPhase 2
High-dose IV vitamin C for severe pneumonia
This trial tests whether high-dose vitamin C given through an IV can improve outcomes in people with severe pneumonia. It may help your body fight infection and reduce complications, but it also has several safety checks.
Alor Star, KedahAges 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 - NCT05951075Recruiting
Power prenatal vitamins study for men with specific sperm results
This study looks at whether a specific “power” prenatal vitamin helps improve sperm measures in men whose at-home sperm test results fall in a certain range. It’s mainly for men living in the US or Canada who aren’t taking other prenatal vitamins already and don’t have known causes of male infertility.
Encino, CaliforniaAges 18–50
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.