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
- NCT06385275RecruitingPhase 1/Phase 2
Vitamin K for Knee Osteoarthritis
This study tests whether taking vitamin K can help with knee osteoarthritis pain and joint health. It is for older adults who have knee OA and are not on blood thinners.
Boston, MassachusettsAges 50 years+ - NCT06903247Enrolling by invitation
Ultrasound Brain Findings in Pregnancy with Low Vitamin D
This study uses ultrasound to check for differences in the baby's brain and spine in pregnant women with low vitamin D levels. It aims to see if vitamin D deficiency during pregnancy is linked to certain ultrasound findings.
SanliurfaAges 18–50 - NCT07268742Recruiting
Vitamin D and steroids in endocrine disorders
This study looks at how vitamin D and steroids work in people with different hormone-related conditions. It may help us understand why some people have trouble with vitamin D and how it affects their health.
LeuvenAges 18 years+ - NCT07012161RecruitingEarly Phase 1
Vitamin D for fibroid symptoms in women with low vitamin D
This trial tests whether taking vitamin D3 can help reduce symptoms like heavy bleeding or pressure from uterine fibroids. It is for women who have fibroids and are also low in vitamin D.
Dhaka, SahabagAges 18–50 - NCT07053657Recruiting
Vitamin D for heart health in overweight teens
This study looks at whether giving vitamin D can improve heart and metabolic health in overweight or obese teens who have low vitamin D levels. It may help lower risks like high blood sugar or cholesterol.
Anqing, AnhuiAges 10–16 - NCT07592975Recruiting
Food with Fiber and B-Vitamins for Gut Health in Older Adults
This study tests whether adding special fibers (prebiotics) and B-vitamins to food can improve your gut bacteria, reduce inflammation, and support mental health. You'll eat fortified foods for several weeks while researchers track changes in your digestion and wellbeing.
Coleraine, County LondonderryAges 50 years+ - NCT07513727Recruiting
Vitamin C Treatment for Dark Gum Pigmentation
This study tests whether vitamin C can safely lighten dark spots or patches on your gums that are caused by natural pigmentation. If you're bothered by how these dark areas look, this trial may help improve your smile's appearance.
Cairo, Cario GovernorateAges 20–40 - NCT07743918Recruiting
Vitamin D and outcomes in locally advanced cervical cancer
This study looks at how vitamin D levels affect treatment results in women with locally advanced cervical cancer who are about to start chemoradiation (chemotherapy plus radiation). It aims to see if higher vitamin D is linked to better outcomes.
Kragujevac, ŠumadijaAges 18–80 - 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+ - NCT03989778RecruitingPhase 2
Vitamin D for PCOS with low vitamin D
This Phase 2 study tests whether vitamin D can improve hormone balance and infertility-related problems in people with PCOS who have low vitamin D. You may be able to join if you’re between 18 and 36, have primary infertility, and meet specific PCOS and vitamin D blood test levels.
Karachi, SindhAges 18–36 - 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 - NCT04355572Recruiting
Vitamin D replacement study for teens at risk of PCOS
This study looks at how taking vitamin D affects hormone levels and emotional well-being in teen girls who may develop PCOS. If you have low vitamin D and meet PCOS risk criteria, the study may test whether vitamin D helps you feel and function better.
New Haven, ConnecticutAges 13–21 - NCT05449522Recruiting
Vitamin D after major trauma in ICU patients
This trial tests whether giving vitamin D to adults in the ICU after major trauma can improve outcomes. It’s meant for people who don’t have certain conditions that raise calcium levels or make feeding with the study plan unsafe.
TaipeiAges 20 years+ - NCT05817851RecruitingPhase 2
Vitamin C by vein after cardiac arrest shock
This Phase 2 study tests whether early high-dose vitamin C given through a vein can improve outcomes for people who remain unconscious after an out-of-hospital cardiac arrest with shock. It may help by supporting recovery during the time when the body is under severe stress.
AmiensAges 18 years+ - NCT05937789Recruiting
Vitamin D3 during early ICU care to help critically ill adults
This trial tests whether starting vitamin D3 soon after ICU admission helps critically ill adults with low vitamin D levels. It may help correct low vitamin D and possibly improve recovery, depending on your health situation.
TaipeiAges 18 years+ - NCT05943457Recruiting
Vitamin K2 for adults with episodic migraine
This trial tests whether taking vitamin K2 can reduce the number of migraine days per month. It may help people who have had episodic migraines for at least a year and meet specific migraine frequency and medication requirements.
Beirut, BeirutAges 18 years+ - NCT06009744Recruiting
Vitamin C and zinc for treating bowel leaks
This trial tests whether high doses of vitamin C and zinc can help heal a type of bowel leak (enterocutaneous fistula) in people who need nutrition through a vein. It might help reduce the output from the fistula and speed up recovery.
Mexico City, Mexico CityAges 18–70 - 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 - NCT06508099RecruitingPhase 2
Vitamin A and D supplements after stem cell transplant
This trial tests whether taking vitamin A and D after a stem cell transplant can help improve recovery. It is for people with certain blood cancers who have a matched donor and are in remission or have low disease activity.
Saint PetersburgAges 18 years+ - 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 - NCT06642428Recruiting
Vitamin D for breast cancer treatment before surgery
This trial tests whether taking vitamin D pills during chemotherapy or targeted therapy (before breast cancer surgery) can improve how well the treatment works and reduce side effects. It is for women with low vitamin D levels.
Xining, QinghaiAges 18–80 - NCT06861062Recruiting
Vitamin D and yeast beta-glucan for type 2 diabetes
This trial tests if taking vitamin D3 and yeast beta-glucan supplements can help control blood sugar and lower heart disease risk in people with type 2 diabetes. It may be an option for those who want to see if supplements can improve their diabetes management.
Nanning, GuangxiAges 40–79 - NCT06867952Recruiting
Vitamin K2 for bone loss with a specific gene change
This study tests whether taking vitamin K2 can help people with low bone density (osteopenia or osteoporosis) who have a specific change in the VDR gene. If you have this gene change, vitamin K2 may work better for you than standard supplements.
NovosibirskAges 40–75 - NCT06983847Recruiting
Long-term study of Vitamin-C Injektopas in vitamin C deficiency
This study observes patients with vitamin C deficiency who receive Vitamin-C Injektopas 7.5 g over time to understand how it is used and its effects. It may help if you have low vitamin C levels.
Vienna, Etc., AustriaAges 18–120
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.