Water Soluble Vitamins
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Vitamins are organic compounds that the body needs for the maintenance of good health and for growth. By convention, the name vitamin is reserved for certain nutrients that the body cannot manufacture and therefore must get from food. Vitamins are further classified as fat soluble or water soluble. 3
Fat-soluble Vitamins
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A vitamin that is soluble in fat solvents and oils (lipo-soluble). Fat-soluble vitamins include vitamins A, D, E, K, F. Absorbed with ingested dietary fat, fat-soluble vitamins are stored in moderate amounts from the gastrointestinal tract. Present in minute amounts in various foods, these vitamins are essential to maintaining normal metabolism and biochemical functions; fat malabsorption may result in fat-soluble vitamin deficiencies. Fat-soluble vitamins are found in many types of foods and may be supplemented with pharmaceutical formulations. 5
Vitamin A
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The word vitamin was originally derived from Funk’s term "vital amine." In 1912, he was referring to Christian Eijkman’s discovery of an amine extracted from rice polishings that could prevent beriberi. Funk’s recognition of the antiberiberi factor as vital for life was indeed accurate. Researchers have since found that vitamins are essential organic compounds that the human body cannot synthesize. Vitamins A, D, K, and E are classified as fat-soluble vitamins, whereas others are classified as water-soluble vitamins. 10