Vitamin
Any of several organic substances that usually are separated into water-soluble (e.g., the B vitamins, vitamin C) and fat-soluble (e.g., vitamins A, D, E, K) groups; small quantities (from 0.00002 percent to 0.005 percent of a diet) are necessary for normal health and growth in higher forms of animal life. The substances commonly known as vitamins are diverse in chemical structure and function.
posted by TiredKnife @ 3:51 PM
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