1, vitamin a
Vitamin A is a large class of substances with retinol structure and biological activity. Carotenoids are provitamins, which can produce retinol and retinaldehyde in the metabolism of small intestine and liver, among which β -carotene is the most important carotenoid.
The main sources of vitamin A in food are animal liver, cod liver oil, dairy products and egg yolk. The main sources of provitamin A are dark vegetables and fruits, such as spinach, carrots and pumpkin.
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