The basic substances of life are water, protein, fat, carbohydrate, vitamin and minerals, of which water account for 85%-90%, protein accounts for 7%-10%, and other nutritious material account for about 4%-6.5% totally. We can see that after removing water, protein will account for more than half of human dry matter, and is the most nutrition that consist of human being.
In the past, people believed that protein was composed of amino acids. With the development of science and technology, the physiologist has found that amino acids was incapable of being protein. Instead, two or more than two amino acids combined into short chain, and then composed of protein, which was called peptide. More than half of human dry matter is protein, which means half of it is peptide. The experience has showed that the function and effect of protein in human being is fished by peptide.
Therefore, the definition of peptide is: a peptide is compound in which two or more amino acids are connected by peptide bonds. It is intermediate between amino acids and protein, functional fragment and structural fragment of protein, active gene part of protein and nutrition and basic substance of life.

The molecule weight of peptide is 180-5000 Daltons, of which 1000-5000 was called large peptide, while 180-1000 was defined small peptide, oligopeptide, low peptide, which was also called small molecule active peptide. The biologist call peptide as amino acid chain, and call small molecule active peptide as biological active peptide.
All active substance of human being exist in the form of peptide. There are various and millions peptides in the body, involving in fields such as harmones, nerves, cell growth and reproduction, and dominating the growth, development, reproduction, metabolism and behavior of human being. They are not only basic substance of human organic cell reproduction, but also have unique physical function, which means improving the metabolism of cell, and repairing human diseased cell. It also directly connect with immune function, an important active substance for body finished immune function and regulated immune. Therefore, peptide plays an important role in guaranteeing normal physical function and protecting health. The effect of peptide on the human body can be summarized in inhibition, activation, improvement and repair. Inhibition means inhibit cell degeneration to balance the immune of body, activation means activate cell activity, improvement means improve and maintain the normal metabolism of cell, and repair means repair diseased cell to protect the cell structure and normal function.
Scientists have studied that many protein molecules contain some active fragments. In the process of digestion, it releases a large of peptide material, and regulate physiology in the body, which can produce effect like harmones.

These peptides are easily absorbed by body. At the same time, they can remove free radicals, anti-aging, strengthen immunity, lower blood pressure, lower blood lipids, lower blood sugar, lose weight, anti-atherosclerosis, antioxidant, prevent heart disease, regulate gastrointestinal function, and promote Fermentation and promotion of calcium and trace element absorption and other physiological function regulation.

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