a nutrient that the body needs in small amounts to function and stay healthy. sources of vitamins are plant and animal food products and dietary supplements. some vitamins are made in the human body from food products. vitamins are either fat-soluble (can dissolve in fats and oils) or water-soluble (can dissolve in water). excess fat-soluble vitamins are stored in the body’s fatty tissue, but excess water-soluble vitamins are removed in the urine. examples are vitamin a, vitamin c, and vitamin e.
出典:Wikipedia
出典:『Wikipedia』 (2011/06/08 09:31 UTC 版)
A vitamin is an organic compound required as a nutrient in tiny amounts by an organism. In other words, an organic chemical compound (or related set of compounds) is called a vitamin when it cannot be synthesized in sufficient quantities by an organism, and must be obtained from the diet. Thus, the term is conditional both on the circumstances and on the particular organism. For example, ascorbic acid (vitamin C) is a vitamin for humans, but not for most other animals, and biotin and vitamin D are required in the human diet only in certain circumstances. By convention, the term vitamin does not include other essential nutrients such as dietary minerals, essential fatty acids, or essential amino acids (which are needed in larger amounts than vitamins), nor does it encompass the large number of other nutrients that promote health but are otherwise required less often. Thirteen vitamins are presently universally recognized.
vitamin precursor
a newly discovered vitamin
a vitamin called calciferol
I take vitamins.
a compound vitamin that has two or more kinds of vitamins
vitamin‐enriched rice
vitaminized processed foods
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