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 | Vitamin - Wikipedia
Some writers include choline as a vitamin. [6] Vitamins have diverse biochemical functions. Vitamin A acts as a regulator of cell and tissue growth and differentiation. Vitamin D provides a hormone-like function, regulating mineral metabolism for bones and other organs. The B complex vitamins function as enzyme cofactors (coenzymes) or the precursors for them. Vitamins C and E function as ...
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 | Vitamin | Definition, Types, & Facts | Britannica
Vitamin, any of several organic substances that are necessary in small quantities for normal health and growth in higher forms of animal life. Vitamins generally cannot be synthesized in amounts sufficient to meet bodily needs and therefore must be obtained from the diet or from some synthetic source.
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 | 10 Most Important Vitamins and What They Do for Your Body
Vitamins are among the most fascinating and essential nutrients for human health. Though tiny in quantity, their impact on life is monumental. They do not provide energy like carbohydrates, fats, or proteins, yet they serve as catalysts and regulators, ensuring that every chemical reaction in your body runs smoothly. Without them, even the most basic functions—breathing, healing, moving ...
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 | Vitamins and Minerals - The Nutrition Source
Vitamins are organic substances that are generally classified as either fat soluble or water soluble. Fat-soluble vitamins (vitamin A, vitamin D, vitamin E, and vitamin K) dissolve in fat and tend to accumulate in the body.
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