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Vitamin A supplementation is known to be highly effective when given to older children in low-income countries, in helping to prevent common infectious diseases such as diarrhoea. However, giving it to newborns has proved more controversial, with conflicting results from trials. There are also concerns about toxicity at this age. Giving it to pregnant women might seem a good idea, but this has been shown to be ineffective in improving their …
Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.