Alpha-carotene is a form of carotene with a ß-ring at one end and an e-ring at the other. It is the second most common form of carotene.
D3: 7-Dehydrocholesterol ? Previtamin D3 ? Cholecalciferol (D3) ? Calcidiol ? Calcitriol (active form) ? Calcitroic acid
D2: Ergosterol ? Ergocalciferol (D2)
D analogues: Dihydrotachysterol - Calcipotriol - Tacalcitol
D4: Dihydroergocalciferol
E: Tocopherol - Tocotrienol
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