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Vitamin A & Carotenoids维生素 A

Place · Level 3

视网膜的光开关 · 上皮屏障的维护者 · 免疫成熟的分化信号

Nearby

Vitamin D
Vitamin A
Vitamin E
Vitamin K2
Vitamin K1

Related

Vitamin DThe sunshine, hormone-like vitamin
Vitamin EThe quiet lipid-membrane antioxidant
Vitamin K2Sends calcium to bone, keeps it out of arteries

Two entry forms

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两种入口

Vitamin A isn't one molecule — it's a group of compounds that convert to retinol.

Animal sources = preformed A: liver, egg yolk, and dairy carry mostly retinol / retinyl esters, almost directly usable after absorption.

Plant sources = carotenoids: the beta-carotene in carrots, pumpkin, sweet potato, and dark leafy greens must first be cleaved in enterocytes by BCMO1, then converted to retinol. Conversion efficiency varies widely: dietary fat, gut health, and genetic variants all influence it.

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