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在人群调查中维生素Ａ缺乏常与缺铁性贫血共存，为阐明其中的关系，设计了三种含维生素和微量元素的胶囊给山区中学自带菜（一般为简单的干菜）的住校生各１００名服用。Ａ组为全量，Ｂ组去除维生素Ａ，Ｃ组为安慰剂葡萄糖。连续三个月，为单盲法试验／结果表明，在其他营养素供给充分的条件下，维生素Ａ使血清维生素Ａ、暗适应状况改善的同时，血红蛋白水平由试验前的１２１．１ｇ／Ｌ提高为三个月后的１３４．７ｇ／Ｌ，并使血清铁、运铁蛋白饱和度、血清铁蛋白、转铁蛋白有显著改善。血清视黄醇当量与血红蛋白、血清铁、运铁蛋白饱和度和转铁蛋白呈明显的正相关。提示维生素Ａ有助于改善血红蛋白及铁状况。
In the crowd survey of vitamin A deficiency often coexist with iron deficiency anemia, in order to elucidate the relationship between the design of three kinds of vitamins and trace elements capsules to the mountain middle school bring their own dishes (usually simple dried vegetables) of the resident students each 100 Name to take. The total dose in group A, vitamin A in group B, and placebo in group C. For three consecutive months, as a single-blind trial / the results showed that vitamin A under the conditions of adequate supply of other nutrients to improve serum vitamin A, dark adaptation at the same time, the hemoglobin level increased from 121.1g / L before the test to 134.7 g / L after three months and significantly improved serum iron, transferrin saturation, serum ferritin, and transferrin. Serum retinol equivalence was positively correlated with hemoglobin, serum iron, transferrin saturation and transferrin. Tip Vitamin A helps to improve hemoglobin and iron status.