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
- NCT05913180RecruitingPhase 2
Vitamin C to prevent urine infections after gynecologic surgery
This Phase 2 study tests whether taking vitamin C can lower the chance of getting a urinary tract infection (UTI) after planned gynecologic surgery. It may help people who want to reduce post-surgery infection risk.
MoscowAges 18–80 - NCT07431762RecruitingPhase 4
Aspirin vs. Warfarin after bioprosthetic valve surgery
This trial compares aspirin to warfarin in the first six months after receiving a bioprosthetic (tissue) heart valve. It aims to find which treatment better prevents blood clots without causing excessive bleeding.
OsakaAges 19 years+ - NCT07092618RecruitingPhase 2/Phase 3
Trial for keeping weight off after stopping GLP-1 meds
This study tests if other medicines (naltrexone, metformin, or rapamycin) can help people keep off weight they lost while taking GLP-1 drugs like Wegovy or Ozempic, after they stop taking them. It is for AgelessRx patients aged 40 to 85 who have lost at least 15 pounds on GLP-1s.
Chicago, IllinoisAges 40–85 - NCT06410443Recruiting
Steroid treatment for radiation-induced bowel injury
This trial tests if local steroids can help heal bowel damage caused by radiation therapy for cancer. It may reduce pain, bleeding, and urgency, and improve quality of life.
Shenyang, LiaoningAges 18 years+ - NCT07491601Recruiting
Preventing low parathyroid after thyroid surgery
This study aims to find ways to detect and prevent low parathyroid function after thyroid surgery. If you are having your whole thyroid removed, joining could help researchers learn how to improve recovery.
Würzburg, BavariaAges 18 years+ - NCT07484061Recruiting
Drinkable supplement for hair loss in women on weight-loss drugs
This trial tests if a special drinkable supplement can help prevent or reduce hair loss in women who are taking a GLP-1 or GIP receptor agonist (a type of weight-loss or diabetes medication). The study looks for women who have just started this medication or have been on it for less than 3 months.
Madrid, MadridAges 35 years+ - NCT06087783Recruiting
Nutrition supplement study for gynecologic cancer patients on chemo
This study tests whether a special protein, leucine, and vitamin D drink can help women with gynecologic cancer stay stronger during platinum-based chemotherapy. If you're starting your first chemo cycle and can do most daily activities, you may be eligible.
Pavia, ItalyAges 18 years+ - NCT07383974Recruiting
12-week study: how diet affects skin and health
This trial tests whether eating more fruits and vegetables for 12 weeks can improve your skin and how you feel physically. It uses a special light scanner to measure skin health.
Shanghai, Shanghai MunicipalityAges 18 years+ - NCT05670262Recruiting
Study vitamin D and gut bacteria in childhood allergies
This study looks at how gut bacteria (microbiome) and vitamin D levels in newborns may influence whether children develop allergies. It starts with newborn babies and aims to better understand what early factors could predict allergic diseases.
TaichungAges birth–1 year - NCT07296471Recruiting
Vitamin D and Bone Health Study
This study is looking at how vitamin D levels relate to bone health and overall health markers in people with and without osteoporosis. It aims to find better ways to understand and treat bone loss.
Yichang, HubeiAges 18 years+ - NCT07119788Recruiting
Haskap berry supplement for cognitive health
This study tests whether a supplement made from haskap berries can help improve cognitive health in older adults. If you are 50 or older, eat few fruits and vegetables, and are generally healthy, you may be able to join.
ReadingAges 50 years+ - NCT07222111Recruiting
Dried plums for immune health in postmenopausal women
This study tests whether eating dried plums every day can improve immune function in women after menopause. Participants will eat dried plums and provide stool samples at four times during the study.
Indianapolis, IndianaAges 60–75 - NCT06982703Enrolling by invitation
Butyrate for antibiotic-related diarrhea
This trial tests if a supplement called butyrate can prevent or reduce diarrhea caused by antibiotics. If you're starting antibiotics, you may be able to join.
PadovaAges 18–80 - NCT06776640Recruiting
Vitamin D3 before dental implant surgery for better bone bonding
This trial tests whether taking vitamin D3 pills before and after dental implant surgery helps the implant bond better with the bone. It is for people who have low vitamin D levels and are already scheduled for an implant.
Nantes, NantesAges 18 years+ - NCT06707909RecruitingPhase 4
Vitamin K2 gel for bone healing after tooth extraction
This study tests if applying a vitamin K2 gel directly into the tooth socket after extraction can help rebuild healthy bone faster. It is for people who need to have a single-rooted lower tooth removed.
Cairo, Cairo GovernorateAges 18–80 - NCT07021248RecruitingPhase 4
Bariatric supplements after weight loss surgery
This study tests whether taking special supplements after weight loss surgery can help keep your vitamin levels healthy and avoid too much vitamin B6. If you are having your first weight loss surgery, you can join—as long as you are not pregnant, not allergic to B6, and meet the weight and health requirements.
Alexandria, EgyptAges 18–65 - NCT07665723RecruitingPhase 1
Study of afimkibart and other medicines in ulcerative colitis
This study looks at how afimkibart affects the way your body processes certain other medicines. It is for people with moderate to severe ulcerative colitis and helps researchers understand how to use this treatment safely.
Chula Vista, CaliforniaAges 18–60 - NCT07331103Recruiting
Can a special diet reduce inflammation for heart health?
This study tests whether a special diet can reduce inflammation and improve heart health in people over 55 who are at increased risk for heart disease but have not yet had a heart attack or stroke.
Avellino, AVAges 55 years+ - NCT07658989Recruiting
Blood thinners in pregnancy with mechanical heart valves
This study looks at the best way to manage blood thinners for pregnant people who have mechanical heart valves. It aims to find the safest approach for both the mother and the baby.
Toronto, OntarioAges 18–45 - NCT07256769Recruiting
Vitamin K, D-chiro inositol and α-lactalbumin for bone health
This trial tests a combination of vitamin K, D-chiro inositol, and α-lactalbumin to help maintain bone strength in women with breast cancer who are on hormone therapy and have low vitamin D. It aims to see if these supplements improve bone health while you take a standard bone medication (alendronate).
Latina, ItalyAges 35–70 - NCT07715669RecruitingEarly Phase 1
Antidepressants to improve blood vessel health after preeclampsia
This study looks at whether antidepressant medication can help improve blood vessel health in women who have had preeclampsia or a normal pregnancy. It may help lower future heart risks.
Iowa City, IowaAges 18–45 - NCT07271966Recruiting
Vitamin B6 for Keppra side effects in brain tumor patients
This trial tests whether vitamin B6 can help reduce mood and behavior side effects of levetiracetam (Keppra) in people with brain tumors and seizures. If you're taking Keppra and feeling down or distressed, this study might offer a way to feel better.
Durham, North CarolinaAges 18 years+ - NCT03008525Recruiting
Testing vitamin D levels in body fat tissue during surgery
This study measures vitamin D (and related forms) in fat tissue samples taken during surgery. It compares people with obesity to people without obesity to understand how vitamin D is handled in fat.
MarseilleAges 18–65 - NCT03516968RecruitingPhase 3
Monthly vs daily vitamin D for obese children
This study compares taking vitamin D as a monthly dose versus a daily dose in children with low vitamin D levels. It aims to correct the vitamin D deficiency and see which schedule works best and is safe.
BronAges 5–18
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.