No side effects. The component of fat-dissolving needle is phosphatidylcholine, which is extracted from soybean and is a component of cell membrane. Clinically, it is used to treat fat embolism, eliminate triglyceride in blood, lower cholesterol and dissolve lipoma. In addition, it does not have any metabolic side effects on the liver and has been used in clinic. Demag fat-dissolving needle also contains insulin-like growth factor, which is also involved in regulating cell growth and differentiation and DNA synthesis; There is also L-carnitine, which is a kind of vitamin nutrient in animals, plants and microorganisms, and has important physiological functions such as promoting fatty acid oxidation and improving body tolerance.