Vitamin A comes from two dietary sources: preformed vitamin A in animal foods and provitamin A carotenoids in orange plant pigments. The conversion of carotenoids into vitamin A is influenced by various factors. Contrary to popular belief, carrots and spinach contain carotenoids, not vitamin A. The richest sources of vitamin A are liver, cod liver oil, and fortified dairy products. Always check labels when buying vitamin A supplements.
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