Vitamins, also known as vitamins, are indispensable nutrients for the human body. It was named "life-sustaining nutrient" by Polish scientist Fink.
Vitamins are an organic compound necessary to maintain health. This kind of substance is neither the raw material of body tissue nor the source of energy in the body, but a kind of regulating substance, which plays an important role in substance metabolism. Because these substances cannot be synthesized in the body or the amount of synthesis is insufficient, although the amount needed is small, it always depends on food supply.
Vitamins, also known as vitamins, are life-sustaining substances, organic substances necessary to maintain human life activities and important active substances to maintain human health. The content of vitamins in the body is very small, but it is indispensable.
The definition of vitamins requires that vitamins meet the following four characteristics before they can be called essential vitamins.
Exogenous: The human body cannot synthesize itself and needs food supplement.
Trace: The human body needs little, but it can play a great role.
Regulation: Vitamins must be able to regulate human metabolism or energy conversion.
Specificity: Without certain vitamins, people will show a unique pathological state.
According to these four characteristics, the human body needs 13 kinds of vitamins, namely 13 kinds of essential vitamins: vitamin A, vitamin B, vitamin C, vitamin D, vitamin E, vitamin K, vitamin H, vitamin P, vitamin PP, vitamin M, vitamin T, vitamin U and water-soluble vitamins.