Niacinamide, also known as nicotinamide, is an amide compound of niacin, a white crystalline powder, which is mainly used clinically to prevent and control pellagra, stomatitis, linguitis and other related diseases. Since nicotinamide belongs to B vitamin derivatives, and nicotinamide is also a component of coenzyme, becoming a coenzyme of many dehydrogenases is an essential component for human body. It is mainly used clinically to prevent and control pellagra, stomatitis and linguitis, and can even be used to prevent the occurrence of diseases such as heart block. In pregnant women, there is still a teratogenic potential if this nicotinamide is applied in higher amounts over a short period of time. Due to its potential dangers, it is recommended to avoid its use in the early stages of pregnancy as much as possible. When necessary in the middle and late stages of pregnancy, be sure to talk to your doctor to avoid its use.