What is collagen a substance? Collagen is one of the most widely used biomedical materials with a high degree of safety and biocompatibility. It has been in clinical use for more than 20 years without any serious side effects. There are about 3 kg of collagen in an adult’s body, which mainly exists in human skin, bones, eyes, teeth, tendons, internal organs (including heart, stomach, intestines, blood vessels) and other parts of the human body, and its function is to maintain the morphology and structure of the skin and tissues and organs, and it is also an important substance for repairing various damaged tissues. In human skin composition, 70% is composed of collagen. When collagen is insufficient, not only the skin and bones will have problems, but also the internal organs will be adversely affected. In other words, collagen is an indispensable ingredient for maintaining normal body activities. It is also the substance that keeps the body young and prevents aging. In addition, collagen prevents diseases and improves physical fitness, which is helpful for both beauty and health. How does collagen work for beauty? Collagen backfill is a treatment that has been clinically proven its safety to treat wrinkles, scars or depressions in the soft tissues of the skin of the face and correct the shape of the face. Collagen cosmetic injections have been shown to be effective in correcting wrinkles, depressions and scars in the soft tissues of the human face, giving patients a new look. Are collagen injections safe? Collagen is one of the most widely used biomedical materials with a high degree of safety and biocompatibility. It has been in clinical use for over 20 years without any serious side effects.