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trivial name for carotenoids exhibiting qualitatively the biologic activity of β-carotene, that is, vitamin A precursors (α-, β-, and γ-carotene and cryptoxanthin); contained in fish liver oils, spinach, carrots, egg yolk, milk products, and other green leaf or yellow vegetables and fruits.
Carotenoid precursors of vitamin A found in some red and yellow fruits and vegetables.
provitamin Ageneric term for all vitamin A precursors; same biological activity as beta-carotene
a substance, e.g. ergosterol, from which the animal organism can form a vitamin.