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美国的一项研究表明β- 胡萝卜素和维生素A的保健作用已面临许多大规模研究的挑战。β-胡萝卜素的实验室和动物研究均显示出其预防癌症的效果,同时对AIDS病人的研究亦表明对免疫系统有良好的作用。胡萝卜素和视黄醇功效试验(CARET)是进行10年的一项试验,该试验检测β-胡萝卜素和维生素A(视黄酸棕榈酸)对降低以前曾吸烟、目前吸烟及接触过石棉的男性吸烟者肺癌发生率的效果。
A US study shows that the health benefits of beta-carotene and vitamin A have been challenged by many large-scale studies. Laboratory and animal studies of beta-carotene have all demonstrated their effectiveness in preventing cancer, and research on AIDS patients has also shown to have a beneficial effect on the immune system. Carotene and Retinol Efficacy Test (CARET) is a 10-year trial that tests the effect of beta-carotene and vitamin A (palmitic acid retinoic acid) on reducing previous smoking, current smoking and exposure to asbestos Male smokers the incidence of lung cancer.