Vitamins is an organic molecule (or related set of molecules) that is an essential micronutrient that an organism
needs in small quantities for the proper functioning of its metabolism. Vitamins are classified as either water-soluble or
fat-soluble. In humans there are 13 vitamins: 4 fat-soluble (A, D, E, and K) and 9 water-soluble (8 B vitamins and vitamin
C). Water-soluble vitamins dissolve easily in water and, in general, are readily excreted from the body, to the degree that
urinary output is a strong predictor of vitamin consumption. Fat-soluble vitamins are easier for the body to store than
water-soluble.
Because they are not as readily stored, more consistent intake is important. Fat-soluble vitamins
are absorbed through the intestinal tract with the help of lipids (fats). You can usually get all your vitamins from the
foods you eat. Your body can also make vitamins D (from exposure to sunlight) and vitamins K. People who eat a vegetarian
diet may need to take a vitamin B12 supplement. Some foods are fortified with vitamins not normally present in them
(e.g., vitamin D is added to milk).
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