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Having low beta-carotene levels in our blood is associated with a two to three fold increased risk of dying from heart disease (http://1.usa.gov/RyE8HT). The best sources of dark green leafy and orange vegetables, not supplements: http://nutritionfacts.org/video/some-dietary-supplements-may-be-more-than-a-waste-of-money/
People taking dietary supplements may, in some cases, be paying to make themselves sick. This video covers folic acid, beta carotene, and green tea supplements.
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