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how is B-carotene used in humans?
Biologically, beta-carotene is most important as the precursor of vitamin A. It also has anti-oxidant properties and may help in preventing cancer and other diseases.
While animal studies show that beta-carotene is not toxic to a fetus or a newborn, there is not enough data on beta-carotene in humans to know what levels are safe. To be cautious, take beta-carotene supplements only under the supervision of your doctor if you are pregnant or breast-feeding. It's safe to get beta-carotene through the food you eat.
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WebElements: the periodic table on the WWW [http://www.webelements.com/]