1, vitamin A

Vitamin A is a large class of substances containing retinol structure and biological activity, carotenoids are a vitamin A original, in the small intestine and liver metabolism process can generate retinol and retinaldehyde, of which beta carotene is the most important class of carotenoids. carotenoids.

The main sources of vitamin A in food are animal liver, cod liver oil, dairy products, egg yolks, etc.; the main sources of vitamin A pro-vitamin A are dark-colored vegetables and fruits, such as spinach, carrots, pumpkin, etc.

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