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本文对８２名１２一１５岁、体重３５一４５公斤的农村初中学生进行了ＶｉｔＡ、β一胡萝卜素的补充实验研究。实验组１（ｎ＝２１）每天补充２ｍｇβ一胡萝卜素，实验组２（ｎ＝１９）每天补充６ｍｇβ一胡萝卜素，实验组３（ｎ＝２４）每天补充４００ｕｇＲＥＶｉｔＡ，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，将两补胡萝卜素改为补ＶｉｔＡ１２００ｕｇＲＥ，补ＶｉｔＡ组改补６ｍｇβ一胡萝卜素。对照组（ｎ＝１８）给予安慰剂。结果显示：每天摄入ＲＤＡ剂量和２倍ＲＤＡ剂量的β－胡萝卜素，对于提高机体ＶｉｔＡ、β－胡萝卜素水平的效果是相同的，而直接补充ＶｉｔＡ，机体ＶｉｔＡ、β一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ＶｉｔＡ在ＶｉｔＡ营养中具有胡萝卜素不可替代的作用。
In this paper, 82 junior high school students aged 12-15 years old and 35-45 kg in weight were enrolled in the study of vitamin A and beta-carotene supplementation. In the experimental group 1 (n = 21), 2 mg β-carotene was supplemented daily, 6 mg β-carotene was added to the experimental group 2 (n = 19) daily and 400 μg REVitA was supplemented in the experimental group 3 , The sixth weekend and the eighth weekend blood test. The seventh week in the experiment, the two carotene replaced VitA1200ugRE, VitA group to make up for 6mgβ-carotene. Control group (n = 18) were given placebo. The results showed that daily intake of RDA and 2-fold RDA doses of β-carotene had the same effect on increasing VitA and β-carotene levels. VitA and VitA, β-carotenoid levels were slightly higher In the carotene group. This study explored the exact nutritional status of adolescents in China, also suggested VitA nutrition with carotenoids irreplaceable role.