Treatment
Vitamin A clinical trials
We’re tracking 254 recruiting studies that include Vitamin A, each written for real people, not researchers, below.
Recruiting studies
- NCT06915701RecruitingPhase 2/Phase 3
Vitamin E for rheumatoid arthritis inflammation
This study tests whether adding vitamin E to standard rheumatoid arthritis treatment can reduce inflammation and disease activity. It is designed for women with early RA who are not getting enough vitamin E from their diet.
Guadalajara, JaliscoAges 18 years+ - NCT05942053RecruitingPhase 4
Vitamin K2 for chronic kidney disease with high urine protein
This trial studies whether vitamin K2 can help people with chronic kidney disease (kidney damage that lasts months or longer), especially those with higher protein levels in the urine. It compares vitamin K2 use in a specific group and watches kidney-related health outcomes and safety.
Tanta, Capital of Gharbia Governorate.Ages 18 years+ - NCT06794255Recruiting
Vitamin C for healthy aging in middle-aged adults
This study looks at whether vitamin C can help support healthy aging in middle-aged and older adults. It will compare taking vitamin C to a placebo (a dummy pill) to see if it improves overall health.
Nanchang, JiangxiAges 18–70 - 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 - 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+ - 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 - NCT06736002Recruiting
Vitamin D for epilepsy: fewer seizures, less fatigue
This trial tests whether high doses of vitamin D can help reduce seizures and improve fatigue and quality of life in adults with refractory epilepsy who have not responded well to at least two medications.
TainanAges Any age - 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 - 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+ - NCT06649825Enrolling by invitation
Vitamin B1 for familial adenomatous polyposis
This trial tests whether taking vitamin B1 can help people with familial adenomatous polyposis (FAP) reduce the number of polyps in their colon or rectum. It is designed for people who still have most of their bowel and have more than 10 polyps.
Shanghai, Shanghai MunicipalityAges 18–80 - NCT06569264Recruiting
Comparing socket preservation methods after tooth extraction
This trial tests two different treatments to preserve the bone and gum after a tooth is removed. It compares using a dentin graft with I-PRF (a special blood concentrate) to the same treatment with added vitamin C. The goal is to see which helps the healing better before a dental implant.
CairoAges 18–65 - NCT06581900Recruiting
Vitamin B12 in kids with sickle cell disease
This study looks at how children with sickle cell disease process vitamin B12 when exposed to a gas painkiller called MEOPA. It may help doctors understand how to manage treatment better.
ReimsAges 2–18 - 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+ - NCT06445933Recruiting
Vitamin B6 for depression in pregnancy and after birth
This trial tests whether taking Vitamin B6 can help prevent depression in pregnant women and new mothers. If you are between 24 and 28 weeks pregnant and have no history of mental health conditions, you may be able to join.
TaipeiAges 20–50 - 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 - NCT06336902RecruitingPhase 1
Immunotherapy plus fasting diet and vitamin C for KRAS-mutated colorectal cancer
This trial tests a combination of two immunotherapy drugs (botensilimab and balstilimab) plus a fasting-mimicking diet and high-dose vitamin C for people with a specific type of advanced colorectal cancer (KRAS-mutated). It aims to see if this approach can help when standard treatments have stopped working.
Fullerton, CaliforniaAges 18 years+ - NCT06306183Recruiting
Vitamin C for pain relief after an ER visit
This trial tests whether a high dose of vitamin C can help reduce pain for people who come to the emergency department with new muscle or bone pain. If you qualify, you will receive vitamin C or a placebo and track your pain over time.
Ottawa, OntarioAges 18 years+ - NCT06206759Recruiting
Vitamin C for triglyceride levels in ICU patients
This trial looks at whether giving vitamin C through an IV can help lower triglyceride levels in patients in the intensive care unit. It compares patients who received vitamin C with similar patients who did not.
Kfar SabaAges 18–99 - NCT06201013Recruiting
Vitamin D for children with wet overactive bladder
This trial tests whether giving vitamin D to children with 'wet' overactive bladder (OAB) – where they leak urine with sudden urges – can help improve symptoms. It's for children aged 5 and older who have low vitamin D levels and no other serious health conditions.
Chongqing, Chongqing MunicipalityAges 5–18 - NCT06138249Recruiting
Vitamin D supplements for low vitamin D levels
This trial tests two forms of vitamin D (cholecalciferol and calcifediol) to see which better raises vitamin D levels in people with a deficiency. It may help you if your vitamin D is low, but you don't have osteoporosis or liver/kidney problems.
BariAges 18–80 - NCT06123715RecruitingPhase 2
Vitamin C to reduce pain after knee replacement
This study tests whether taking vitamin C before and after knee replacement surgery can reduce long-term pain. You may be eligible if you are having knee replacement for osteoarthritis and are generally healthy.
Toronto, OntarioAges 18 years+ - 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 - 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+ - 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
Common questions
- Are there clinical trials studying Vitamin A?
- Yes. Clin2 currently lists 254 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.