Human vitamin A is derived from the natural food. Natural vitamin A exists in different forms. Vitamin A not only significantly affects visual function but also has a greater physiological impact than visual function, especially for reproduction and embryonic development, immune function, and maintaining healthy skin. Vitamin A in clinical applications includes two aspects: one is to treat vitamin A deficiency disease, and the other is to prevent vitamin A deficiency. Therefore, vitamin A will protect the health of the healthy people and relieve the pain of vitamin A-deficient people. The process of vitamin A discovery provides a very valuable experience and effective drugs for the medical sciences. And the understanding of vitamin A provides a reliable material and rational understanding for the prevention of human disease.
KeywordsVitamin A Retinol Night blindness
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