vitamin

Vitamin, also known as vitamin, is essential to maintain human life activity of a class of organic substances, is also important to keep active substances to human health. Contain only small amounts of vitamin in the body, but essential. The chemical structure of various vitamins and nature are different, but they do have in common the following: ① vitamins are pro-vitamin (vitamin precursor) form of vitamin found in foods ② not constitute a body composition of tissues and cells, it also does not produce energy, and its role is mainly involved in the regulation of metabolism ③ most of the vitamins, the body can not be less than the amount of synthetic or synthetic, can not meet the body's needs, must always be obtained through food in the body's vitamin requirements ④ small Japanese requirements often milligrams (mg) or microgram (μg) calculations, but once the lack of will give rise to a corresponding vitamin deficiency disease, damage to human health. Vitamins and carbohydrates, fats and proteins three major physical differences in the natural food, only a very small proportion, but they are necessary for the human body. Some vitamins such as B6, K and so can be from animal gut bacteria synthesis, synthesis to meet the needs of animals. Animal cells can be of tryptophan into niacin (a B vitamin), but inadequate generating capacity needs; vitamin C addition to primates (including humans) and guinea pigs, other animals can be its own synthesis. Plants and most micro-organisms can be their own synthesis of vitamins, are not required to supply in vitro. Many vitamins are cofactor or coenzyme component.

Human and animal nutrition, growth necessary for some of the small amount of organic compounds on the body's metabolism, growth, development, health, a very important role. If the chronic lack of certain vitamins, can cause physiological dysfunction which occurs in some diseases. Generally obtained from the food. Now find there are dozens of species, such as vitamin A, vitamin B, vitamin C, etc.