Many of the symptoms of vitamin A deficiency, such as blindness and an increase in respiratory infections, are related to the role of vitamin A in:

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Vitamin A is essential for maintaining the health of epithelial cells, which line the surfaces of the body and protect against infection. Vitamin A deficiency can lead to a breakdown of these cells, which can increase the risk of respiratory infections and other health problems.

Many of the Symptoms of Vitamin a Deficiency, Such as Blindness