Potassium sorbate is a synthetic preservative, which is a food additive allowed in China, mainly used in food, beverage and cosmetics. According to the scope of application and the amount of use, the general toxic side effects are small. The right amount of potassium sorbate can participate in the normal metabolism of human body, and the metabolites can be excreted out of the body. Therefore, people who are not allergic to potassium sorbate will not have significant negative effects on the body after moderate intake. However, long-term or excessive intake may cause the following hazards: 1, stimulate the skin: if you use skin care products and cosmetics containing more potassium sorbate for a long time, it may cause some skin irritation, resulting in some people’s skin redness, swelling, rash, accompanied by pain and burning sensation, etc.; 2, stimulate the gastrointestinal tract: if the patient eats a lot of food with more potassium sorbate for a long time, resulting in Potassium sorbate intake is excessive and accumulates in the body, which can stimulate the mucous membrane of the gastrointestinal tract and increase the burden on the gastrointestinal tract and liver detoxification; 3, other: excessive intake of potassium sorbate can also have an adverse effect on human metabolism and absorption, which affects the body’s absorption of vitamins and minerals and other nutrients, and can even cause damage to liver and kidney function in severe cases.