Whether vitamin A 13-year-old boy can take depends on whether the boy has indications, such as night blindness. Vitamin A, also known as anti-dry eye factor and retinol, is a normal part of the human body, and is a vitamin drug, with the role of promoting growth, maintaining the normal function of epithelial tissues, such as the skin, cornea, and the synthesis of retinoschisisin, enhance retinal photoreceptivity and so on. If a boy is deficient in vitamin A, it is possible to take it. However, it should be noted that vitamin A is recommended to be taken under the guidance of a doctor, and should not be used privately, so as not to cause vomiting, lack of appetite, chronic poisoning and other adverse reactions.