Medical Definition of beta–carotene
: a reddish-orange pigment that is an an isomer of carotene found chiefly in orange and dark green and yellow vegetables and fruits (such as carrots, sweet potatoes, and spinach) and that is converted to vitamin A in the body ◆Beta-carotene is the most active and widespread provitamin A and is derived commercially from natural sources or is prepared synthetically.
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