Based on the findings from a new study, it appears that people who take higher than recommended doses of carotenoid supplements hoping to keep from getting sick, may actually be doing themselves harm. The long-term use of beta-carotene, retinol, and lutein supplements at doses higher than in multivitamins, increases
lung cancer risk, especially in smokers and former smokers, according to investigators from the Vitamins and Lifestyle (VITAL) study.
High-dose beta-carotene supplements increase the lung cancer rates in high-risk individuals, even though carotenoids from dietary sources tend to lower risk, Dr. Jessie A. Satia and co-researchers note in the American Journal of Epidemiology. "Whether effects are similar in the general population is unclear."
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