Polysaccharide (English: polysaccharide) is formed by dehydration polymerization of multiple monosaccharide molecules, which are connected by glycosidic bonds. It can form straight chain or branched chain, and after hydrolysis, the corresponding monosaccharides and oligosaccharides can be obtained. For example, starch and glycogen are used to store energy, and cellulose and chitin are used to form biological structures.

Polysaccharides usually consist of slightly modified repeating units. Because of different structures, polysaccharide polymers and monosaccharide molecules that make up it have different properties, which may be amorphous or even insoluble in water.

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Scientists warn: "Without immunity, life will stop". Experts at home and abroad have proved that all large fungi, almost without exception, have good immune regulation, mainly because they all contain "polysaccharides".

Polysaccharide is very common in daily life. The rice we eat, the starch in noodles and the cellulose in vegetables are all polysaccharides. There are also some health-preserving ingredients in life, such as mushrooms, poria cocos and tremella, which also contain polysaccharides, which are called lentinan, poria cocos polysaccharide and tremella polysaccharide respectively.

These polysaccharides have been proved to have some specific activities or functions by cell experiments or animal experiments, such as enhancing immunity, relieving physical fatigue, delaying aging and so on. The polysaccharide added in some health foods is this kind of polysaccharide with specific activity or efficacy.

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