07/21/2022
Vitamin A deficiency is a pressing public health problem in low- and middle- income countries. It affects 190 million children under five years of age and leads to many adverse health outcomes including respiratory diseases, diarrhea, measles, and vision problems.
Previous studies have suggested that giving synthetic vitamin A supplementation to children aged six months to five years can reduce the risk of death and some diseases. This review looked at the effect of synthetic vitamin A supplementation compared to placebo. Searching through relevant literature, reviewers combined the results of 47 RCTs representing 1,223,856 children in regions including Asia, Africa, Latin America, and Australia.
The data indicated that vitamin A supplementation reduces overall risk of death and death due to diarrhea by 12%. It does not specifically reduce death due to measles, respiratory infections, or meningitis, but it can reduce new occurrences of those diseases. It does reduce the risk of night blindness and Bitot’s spots, tiny flakes of protein in the eye. The certainty of evidence using the GRADE approach was rated as high for benefits of vitamin A supplementation against overall risk of death and death due to diarrhea.
Further reviews may investigate delivery channels for vitamin A supplements, including food-based routes and improved access to food or social programs to increase the uptake of vitamin A-rich foods.