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There are two forms of vitamin A: retinoids (biologically active) and carotenoids (non-biologically active). Beta carotene generally functions as an antioxidant, though it can be metabolized to a biologically active form of vitamin A.

Sources of retinoids include liver, eggs, fish oils, and fortified milk.

Sources of carotenoids include leafy, dark green and dark orange vegetables and fruits.

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15y ago

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