Vitamin Basics What Are Vitamins

For a substance to be added to the highly dignified list of vitamins, it must be recognized as an essential player in at least one necessary chemical reaction or process in the body. Vitamins are non-caloric substances and are required in very small amounts, typically micrograms (p.g) to milligram (mg) quantities. A microgram and a milligram are one-millionth and one-thousandth of a gram, respectively. Vitamins either can't be made in the body or are not made in sufficient quantities to meet our needs. We will discuss two vitamins (niacin and vitamin D) that can be made in the body, and two others (vitamin K and biotin) that are made by the bacteria inhabiting the large intestine. However, they are still considered vitamins, which will be explained shortly.

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