Vitamin A deficiency

This trial tests whether giving a single high dose of vitamin A before an allogeneic stem cell transplant can reduce the chance of developing moderate-to-severe chronic graft-versus-host disease (GVHD), a common and serious complication. Adults scheduled for a stem cell transplan…

This study tests whether injecting a person's own bone marrow stem cells into or near the eye can help treat various retinal and optic nerve diseases, including age-related macular degeneration, retinitis pigmentosa, and glaucoma. Participants receive stem cell injections via dif…

This study tests whether giving vitamin A supplements to children with low vitamin A levels can slow the worsening of scoliosis (curved spine). The trial will include 140 children aged 6 to 15 who have mild to moderate scoliosis and are still growing. Half will get vitamin A plus…

This study tests whether daily high-calorie nutritional supplements can improve growth and development in 200 malnourished children aged 1 to 3 years. One group gets the supplements plus nutrition education, while the other gets only education and diet advice. Researchers will me…

This study compares two types of nutrient supplements—small-quantity and medium-quantity—to see if the smaller one works just as well at preventing undernutrition in children aged 6 to 12 months. About 980 infants in Pakistan will receive one of the two supplements daily for 6 mo…

This study tests whether phentolamine eye drops can improve vision in low light for people who had laser eye surgery and now see glare, halos, or starbursts at night. About 200 adults will use the drops or a placebo every evening for two weeks. The main goal is to see if more peo…

This pilot study tests whether it's possible to run a larger trial comparing plant-based and animal-based oral nutritional supplements (ONS) in hospital patients at risk of malnutrition. Sixty patients from two Dutch hospitals will be randomly assigned to receive either a soy-bas…

This study aims to understand what causes Visual Snow Syndrome (VSS), a condition where people see constant flickering dots across their vision. Researchers will use brain scans and visual tests to find which brain pathways are involved. About 100 adults with VSS, migraine, or he…