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
- 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 - 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 - 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 - NCT06553729Recruiting
Vitamin D and prebiotic supplement for blood sugar during pregnancy
This trial tests whether taking a combination of vitamin D and a prebiotic can help manage blood sugar levels in pregnant women at high risk for gestational diabetes. It may offer a simple way to support a healthy pregnancy.
Zhanjiang, GuangdongAges 18–45 - 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+ - 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+ - 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 - NCT04036188RecruitingEarly Phase 1
Vitamin D and triamcinolone for plaque psoriasis
This early study tests whether taking vitamin D together with triamcinolone (a steroid used on skin) works better for plaque psoriasis than a standard approach. It aims to see if the combination helps clear psoriasis plaques and is safe.
Fairborn, OhioAges 18 years+ - 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+ - NCT02705287Recruiting
Study vitamin D changes in women during pregnancy or adult life
This study measures how vitamin D levels change over about 20 days in women. It may help researchers understand vitamin D patterns in pregnancy and different body sizes, which can guide future health recommendations.
Rochester, New YorkAges 20–39 - 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+ - 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+ - NCT07866391Enrolling by invitation
Vitamin D levels in Zhejiang province
This study looks at vitamin D levels in people in Zhejiang province, China. It aims to understand what factors affect vitamin D levels.
Hangzhou, ZhejiangAges Any age - NCT07859280Recruiting
Vitamin D in eggs for healthy adults
This study tests whether eating eggs enriched with vitamin D can help raise vitamin D levels in healthy adults. If it works, it could be a simple way to improve vitamin D without supplements.
Ithaca, New YorkAges 18–40 - 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 - NCT02735707RecruitingPhase 3
Adaptive trial for severe pneumonia care in intensive care
This study tests ways to improve treatment for adults with severe pneumonia that lands them in the ICU, adjusting the plan as results come in. It may help your care team find better treatments for lung infection and breathing/heart support needs.
Jacksonville, FloridaAges 18 years+ - NCT06551337RecruitingPhase 4
Vitamin D for bronchiectasis patients
This trial tests if taking vitamin D can help people with bronchiectasis have fewer flare-ups. It is only for patients who were in an earlier study that checked their vitamin D levels.
Hong KongAges 18 years+ - NCT07781514Enrolling by invitation
Vitamin E as an add-on to levothyroxine for hypothyroidism
This trial tests whether adding vitamin E to your usual levothyroxine treatment helps improve thyroid function and reduce oxidative stress (a type of cell damage) in adults with hypothyroidism.
DhakaAges 18–75 - NCT06571344Recruiting
Vitamin D in dialysis patients
This trial checks if measuring vitamin D in dialysis patients can lead to better treatment, then gives vitamin D supplements to those who are low. It may help improve your bone and heart health.
GdanskAges 18 years+ - NCT07708233RecruitingPhase 4
Benfotiamine vs vitamin B complex for diabetic nerve pain
This study compares two types of vitamin B supplements to see which one better relieves nerve pain and numbness in people with diabetes. It may help if you have diabetic neuropathy and are looking for a safe, non-drug option.
Pathumthani, BangkokAges 18 years+ - NCT06639789Recruiting
Vitamin B12 effect on cycling performance
This trial tests a new Vitamin B12 supplement to see if it improves physical and mental performance in cyclists. It might help if you are a healthy male cyclist training regularly.
La Ñora, MurciaAges 18–45 - 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 - NCT07684404Recruiting
Vitamin D for dental implant success
This trial tests if taking vitamin D improves how well dental implants bond with the jawbone in people with low vitamin D levels. It may help strengthen the implant integration.
Cairo, New CairoAges 20–60 - 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
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.