vitamin
organic compound and a vital nutrient that an organism requires in limited amounts
vitamin E
generic descriptor for all tocopherols and tocotrienols that exhibit alpha-tocopherol activity
vitamin D
group of molecules used as vitamin
provitamin
precursor form of vitamins
vitamin A
vitamin, class of molecules with related biological function
vitamin B
group of vitamins
vitamin K
fat-soluble vitamins found in foods and marketed as dietary supplements