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In terms of how soon: some effects (like improved alertness) can be within a few days

A large trial reported in 1994 (pdf) that daily megadoses of the antioxidant beta-carotene increased the risk of lung cancer in male smokers by 18 percent and a 1996 trial was stopped early after researchers discovered that high-dose beta-carotene and retinol, another form of vitamin A, increased lung cancer risk by 28 percent in smokers and workers exposed to asbestos

Who should avoid it Pregnant or breastfeeding women should avoid it due to insufficient safety data

Watch Now From diet, to exercise, to detoxification methods, the Sinatras share their high-level thoughts on some of todays top health matters