维生素A被称为“明眸皓齿的美丽维生素。”这是因为,它的主要作用是保持皮肤、毛发、骨骼、黏膜的健康生长,增强视力和生殖机能。维生素A只存在于动物性食物中,植物性食物中没有维生素A,而只有维生素A的前体物质——能够在人体内变成维生素A的胡萝卜素。维生素D维生素D缺乏症 Vitamin A is called “a beautiful vitamin of bright white teeth.” "This is because its main function is to maintain the healthy growth of the skin, hair, bones and mucous membranes and enhance the visual acuity and reproductive function. Vitamin A is found only in animal foods. There is no vitamin A in plant foods, but only the precursor of vitamin A - a carotene that turns vitamin A in the body. Vitamin D Vitamin D deficiency