Chitosan oligosaccharides(chitosan oligosaccharide lactate / COS / chitooligosaccharide / Shrimp shell extract)are easily soluble in water, easily absorbed by organisms and have high availability. They are widely used in the following clinical fields: 1. Lowering blood lipids, chitosan oligosaccharide can prevent the absorption of fat, can increase the absorption of good cholesterol and reduce the absorption of harmful cholesterol, so it can prevent the production of arteriosclerosis, atherosclerotic plaque, and prevent the occurrence of stroke and heart disease. 2. It can slightly lower blood sugar, and oligosaccharide can enhance the sensitivity of insulin after taking it, so it has the effect of lowering blood sugar. 3. There is also a certain antihypertensive effect. For essential hypertension, chloride ions can be excreted by taking a certain amount of chitosan oligosaccharide, so it can reduce angiotensin and reduce blood pressure. 4. It can improve the digestive function of the body. Taking a certain dose of chitosan oligosaccharide can promote the peristalsis of the gastrointestinal tract and have a laxative effect.