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本文对８２名１２～１５岁、体重３５～４５ｋｇ的农村初中学生进行了维生素Ａ、β－胡萝卜素的补充实验研究。实验１组（ｎ＝２１）每天补充２ｍｇ的β－胡萝卜素，实验２组（ｎ＝１９）每天补充６ｍｇ的β－胡萝素，实验３组（ｎ＝２４）每天补充４００μｇＲＥ维生素儿分别在实验初始、第四周末、第六周末和第八周末抽血测定。在实验的第七周，将补胡萝卜素的两组改为补维生素Ａ１０００μｇＲＥ、补维生素Ａ组改为补６ｍｇ的β－胡萝卜素。对照组（ｎ＝１８）给予安慰剂。结果显示：每天摄入营养素推荐摄入量（ＲＤＡ）剂量和２倍ＲＤＡ剂量的β－胡萝卜素，对于提高机体维生素Ａ、β－胡萝卜素水平的效果是相同的，而直接补充维生素Ａ，机体维生素Ａ、β－胡萝卜、素水平略高于补胡萝卜素组。本研究探讨了我国青少年确实的营养状况，也提示维生素Ａ在维生素Ａ营养中具有胡萝卜素不可替代的作用。
In this paper, 82 junior high school students 12 to 15 years old and 35 to 45 kg of body weight were supplemented with vitamin A and β-carotene. In the experimental group 1 (n = 21), 2 mg of β-carotene was supplemented daily, 6 mg of β-carotene was supplemented in experimental group 2 (n = 19), 400 μg of RE vitamin supplemented daily in experimental group 3 The initial test, the fourth weekend, the sixth weekend and the eighth weekend blood test. In the seventh week of the experiment, the two groups of carotenoids were replaced with A1000 μgRE of vitamin A, and the vitamin A group was replaced by 6 mg of β-carotene. Control group (n = 18) were given placebo. The results showed that daily intake of the recommended nutrient intake (RDA) dose and 2 times the RDA dose of β-carotene for the body to improve vitamin A, β-carotene levels are the same effect, and direct vitamin A, body Vitamin A, β-carrot, vegetarian levels slightly higher than the carotene group. This study explored the exact nutritional status of adolescents in China, also suggested that vitamin A in carotenoids with vitamin A irreplaceable role.