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
- 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 - NCT05785585Recruiting
B12 supplements test for people on a vegetarian diet
This study compares two forms of vitamin B12 to see how well they improve or maintain B12 levels in adults who eat vegetarian. It may help people understand which type of B12 works best for supporting normal B12 status.
Reus, TarragonaAges 18 years+ - NCT07654777Recruiting
Vitamin D for better performance in healthy adults
This study tests if taking vitamin D supplements can help young, healthy adults stay sharp and perform well under stress. You may be eligible if your current vitamin D level is low but not severely low.
Silver Spring, MarylandAges 18–40 - NCT07647198RecruitingPhase 2
Green tea extract and vitamin D to prevent fibroid return
This study tests whether two natural supplements—green tea extract (EGCG) and vitamin D—can help prevent uterine fibroids from coming back after treatment. You would take these supplements for 12 months while avoiding pregnancy.
Abu Dhabi, United Arab Emirates (uae)Ages 18 years+ - NCT07648706Recruiting
Vitamin D supplements to prevent pregnancy complications
This study tests whether vitamin D supplements can help prevent preeclampsia (a serious pregnancy condition with high blood pressure) in women with low vitamin D levels. You would take vitamin D pills during pregnancy and be monitored to see if this reduces your risk.
Sanaa, Maeen DistrictAges 18–40 - NCT07595705RecruitingPhase 2
Testing gum pigmentation removal treatments
This study tests treatments to lighten dark spots or patches on your gums for cosmetic reasons. If you have visible brown or black discoloration on your gums and are interested in a minor procedure to improve their appearance, this trial may be for you.
Al Fayyum, Faiyum GovernorateAges 18 years+ - NCT07579078Enrolling by invitation
Vitamin D and Brain Activity in Women With Depression
This study tests whether vitamin D supplements can improve brain wave patterns in women diagnosed with depression who have low vitamin D levels. Researchers will measure brain activity using EEG (a non-invasive test that records electrical signals from the brain) before and after vitamin D treatment.
DhakaAges 20–40 - NCT04179370Recruiting
Vitamin D and health in British African-Caribbean women
This study looks at vitamin D levels and how they relate to overall health in British African-Caribbean women. It may help researchers understand whether vitamin D support or lifestyle changes could benefit this group.
GuildfordAges 18 years+ - NCT07515664RecruitingPhase 4
Vitamin K to Manage Blood Thinning Before Surgery
This study tests whether vitamin K can safely help manage warfarin (a blood thinner) before surgery. If you take warfarin at home and need an upcoming surgery, this trial may help you avoid hospitalization for blood-thinning adjustments.
Ann Arbor, MichiganAges 18 years+ - NCT07491965Recruiting
Vitamin D and Benign Paroxysmal Positional Vertigo (BPPV)
This study looks at whether people with BPPV (a type of vertigo triggered by head movement) have lower vitamin D levels than those who don't have vertigo. Your participation may help clarify if vitamin D plays a role in BPPV.
SohagAges Any age - NCT06772220Recruiting
Homocysteine management for Parkinson's patients on levodopa
This trial tests whether controlling homocysteine levels can help people with Parkinson's disease who are taking levodopa. You may qualify if you take at least 300 mg of levodopa per day, are between 40 and 90 years old, and have no major kidney problems or uncontrolled high blood pressure.
Portland, OregonAges 40–90 - NCT06781970Recruiting
Vitamin C for eye cell protection during cataract surgery
This trial tests whether taking vitamin C before and after cataract surgery can help protect the inner layer of the eye. It is for people aged 60 or older with hard, age-related cataracts who are having phacoemulsification surgery.
Jakarta, DKI JakartaAges 60 years+ - NCT07455656Recruiting
Vitamin D3 or gum massage for faster canine movement with braces
This study tests whether applying vitamin D3 or a special gum massage (corticision) next to the teeth can help move your eye teeth (canines) faster after your upper first premolars are removed for braces. It is for teenagers or young adults who already need that extraction as part of their orthodontic plan.
Cairo, Cairo GovernorateAges 13–20 - NCT07458815Recruiting
Vitamin D for stroke recovery after brain bleed
This trial tests whether vitamin D supplements can help people recover after a specific type of stroke (intracerebral hemorrhage). It is for adults who had a moderate-sized bleed in the upper part of the brain within the last 4 days and were otherwise independent before the stroke.
Hong KongAges 18–90 - NCT07448844RecruitingPhase 4
Comparing vitamin D3 and acyclovir shots for skin warts
This trial tests two injected treatments (vitamin D3 or acyclovir) for common skin warts. The goal is to see which one works better for warts that are new or have not gone away with other treatments.
Rawalpindi, Punjab ProvinceAges 12 years+ - NCT07448974RecruitingPhase 3
Vitamin D for Preventing Type 2 Diabetes
This study tests if taking extra vitamin D can help people with prediabetes keep their blood sugar in a healthy range and lower the chance of developing type 2 diabetes. Participants will take high-dose or standard vitamin D and be monitored for about 2 years.
Boston, MassachusettsAges 30–74 - NCT07435935Recruiting
Vitamin D deficiency and balance study
This study looks at how vitamin D deficiency affects your body's ability to maintain balance and control posture. It may help explain why low vitamin D can impact muscle and bone health.
IstanbulAges 20–40 - NCT07400757Recruiting
Statin and vitamin D for active thyroid eye disease
This trial tests whether a statin (a cholesterol-lowering medicine) combined with vitamin D can improve active thyroid eye disease. It may help if you have both eye inflammation and high cholesterol.
Taipei, TaiwanAges 20 years+ - NCT06446830Recruiting
Vitamin B complex for pain relief after cesarean in ICU
This trial tests whether adding vitamin B complex to standard pain medicine can improve pain control after a cesarean section in critically ill women. It aims to find a safer, effective way to manage pain without relying too much on strong opioids.
Cairo, EgyptAges Any age - NCT06045351RecruitingPhase 1
Vitamin D shots for women with PCOS and low vitamin D
This trial tests whether vitamin D injections can help females with polycystic ovary syndrome (PCOS) who also have low vitamin D levels. Participants will receive the injection and be monitored for changes in their condition.
Karachi, SindhAges 18–45 - NCT07381998Enrolling by invitation
Effects of total thyroid removal on parathyroid function and quality of life
This study looks at how completely removing the thyroid gland affects the nearby parathyroid glands (which control calcium) and your overall quality of life. If you're having a total thyroid removal and meet a few health conditions, you may be able to join.
Aarhus, Central JutlandAges 18 years+ - NCT07379216Recruiting
Vitamin C and glutathione drink for skin health
This study tests a liquid supplement containing vitamin C and glutathione to see if it benefits skin health. It may be a good fit if you are a healthy adult looking to improve your skin without using other skin products during the study.
Pingtung CityAges 18–65 - NCT06842368Recruiting
Immediate implants with vitamin D or hyaluronic acid bone graft
This study compares two types of bone graft materials mixed with either vitamin D or hyaluronic acid for dental implants placed immediately after a tooth is removed. It aims to see which helps the implant heal better.
CairoAges 18–60 - NCT07335432Enrolling by invitation
Vitamin C to reduce blood loss during hysterectomy
This trial tests whether giving vitamin C through a vein before surgery can reduce blood loss during a total abdominal hysterectomy. If you are having this surgery and do not have bleeding problems or other exclusions, this study may help determine a way to make the procedure safer.
Si Racha, Changwat Chon BuriAges 20 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.