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Dose of colors pro3/31/2023 ![]() Additionally, based on current evidence the U.S. Therefore, it is recommended that current or former smokers and workers exposed to asbestos do not use high-dose beta-carotene and retinyl palmitate supplements. In fact, two of those three trials actually found a significant increase in lung cancer risk among study participants taking supplements with beta-carotene or retinyl palmitate (a form of vitamin A). However, three large clinical trials did not find that supplements of beta-carotene and vitamin A helped to prevent or reduce lung cancer risk. Lung Cancer: Observational studies following nonsmokers and current or former smokers have found that higher intakes of carotenoids from fruits and vegetables are associated with a lower risk of lung cancer. The evidence suggests that eating a variety of foods rich in vitamin A, especially fruits and vegetables, is protective from certain diseases, though the health benefit of vitamin A supplements is less clear. The UL for vitamin A from retinol is 3,000 micrograms of preformed vitamin A.
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