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
- 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 - NCT06106646Recruiting
Vitamin C and smoking in pregnancy: long-term lung health follow-up
This study is checking on the long-term lung health of children whose mothers took vitamin C or a placebo during pregnancy and either smoked or did not smoke. It's a follow-up to see if vitamin C might have lasting benefits for their breathing.
Indianapolis, IndianaAges 6–16 - NCT07293910RecruitingPhase 2
Comparing stomach acid drugs for clearing H. pylori infection
This trial tests different combinations of stomach acid-reducing drugs, vitamin D or probiotics, to see which works best for clearing an H. pylori infection. H. pylori is a common stomach bacteria that can cause ulcers or stomach discomfort.
Shibīn al KawmAges 18–80 - 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 - NCT06757244RecruitingPhase 2
Dovipa: Immunotherapy and vitamin D with chemo for advanced pancreatic cancer
This trial tests whether combining the immunotherapy dostarlimab with vitamin D3 and standard chemotherapy (mFOLFIRINOX) can help people with stage IV pancreatic cancer. It aims to see if this new approach is safe and effective.
MarseilleAges 18–75 - NCT06881628RecruitingPhase 4
Tranexamic acid and vitamin K for bleeding in cirrhosis
This trial tests if giving tranexamic acid and vitamin K by injection can help control bleeding from the upper digestive tract in people with liver cirrhosis. It may offer a way to stop bleeding more quickly.
Tanta, GharbyeaAges 18 years+ - NCT07269457RecruitingPhase 2
Vitamin D3 for recovery after mild to moderate brain injury
This trial tests if taking vitamin D3 can help reduce swelling and speed up recovery after a mild to moderate traumatic brain injury. It is for people who have low vitamin D levels.
LagosAges 18–65 - NCT07269223Recruiting
Oral vitamin D3 for inflammation in ulcerative colitis
This study tests whether taking vitamin D3 by mouth can reduce inflammation in people with moderate ulcerative colitis and low vitamin D levels. It may help if you have a confirmed diagnosis and are between 20–40 years old.
Lahore, Punjab ProvinceAges 20–40 - 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 - NCT07241585Recruiting
Vitamin D and light therapy for skin cancer
This trial tests whether taking vitamin D before a special light therapy (photodynamic therapy) can help your body fight nonmelanoma skin cancers like basal or squamous cell cancer. You may join if you are scheduled for surgery to remove a skin tumor.
Cleveland, OhioAges 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+ - NCT07206537Recruiting
Vitamin K2 to prevent steroid bone loss in children
This study tests whether vitamin K2 can help prevent bone loss caused by steroid treatment in children with nephrotic syndrome. If your child meets the requirements, taking vitamin K2 may protect their bones while they receive steroids.
CairoAges 1–16 - NCT06885827Recruiting
Vitamin mix for people with glaucoma
This trial tests whether taking a daily mix of B vitamins (B6, B9, B12) and choline can help slow vision loss in people with certain types of glaucoma. You would take the vitamins or a placebo (inactive pill) for up to 2 years.
Stockholm, Stockholm CountyAges 18 years+ - NCT07119996RecruitingPhase 1
Vitamin B3 to boost immunotherapy for bladder cancer
This trial tests whether taking vitamin B3 can help immunotherapy work better for people with bladder cancer. It’s for patients who have a certain type of bladder cancer and have had a recent infection that needed antibiotics.
Guangzhou, GuangdongAges 18 years+ - 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 - NCT07096414Recruiting
Vitamin D3 and brain waves in men with epilepsy and low vitamin D
This trial tests whether taking vitamin D3 supplements changes brain wave activity in men with epilepsy who also have low vitamin D levels. It aims to see if vitamin D could help improve brain function.
Dhaka, Shahbag, DhakaAges 20–40 - NCT07085598Recruiting
Vitamin D3 for heart nerve health in men with epilepsy
This study tests whether taking vitamin D3 supplements can improve how well the nerves controlling your heart work in men with epilepsy who have low vitamin D levels. If you have low vitamin D from taking certain epilepsy medicines, this trial may help understand if vitamin D can support your heart health.
Dhaka, ShahbagAges 20–40 - 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 - 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+ - NCT01793168Recruiting
Rare disease registry and history study
This study keeps a registry (a structured list) of people with rare diseases and may also track how the condition changes over time. It can help researchers better understand rare illnesses and find gaps in care, which may improve future treatments.
Sioux Falls, South DakotaAges Any age - NCT06983730RecruitingEarly Phase 1
Vitamin B3 and Kidney Response to Exercise in Heat
This study tests how your kidneys respond to exercise in the heat, and whether taking vitamin B3 (niacin) changes that response. It might help protect the kidneys of people who work or exercise in hot conditions.
Boston, MassachusettsAges 18–45 - 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+ - 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 - 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+
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.