Beta-carotene, retinol, and lutein supplements may increase risk of lung cancer
Researchers affiliated with the VITamins And Lifestyle cohort Study have reported that use of individual beta-carotene, retinol, or lutein supplements is linked with an increased risk of lung cancer.
A major study in the Journal of the American Medical Association involving 400,000 participants shows that higher blood levels of vitamin B6 and the amino acid methionine reduce the risk for lung cancer, even in smokers or former smokers.