Glycine is a non-essential amino acid in the human body. Glycine is one of the components of the antioxidant glutathione in the body, which needs to be replenished exogenously when the body undergoes a severe stress response, and is sometimes referred to as a semi-essential amino acid, as well as being one of the simplest amino acids. It has acidic and basic functional groups, strong hydrophilicity, high boiling and melting points, and is a non-polar amino acid. Glycine can be used in medicine, food additives, feed and so on. Used in medicine can be used to treat myasthenia gravis, chronic enteritis, treatment of hyperprolinemia in children and so on. Glycine should not be consumed too much, it will break the amino acid balance of the human body, affecting the health of people, especially on the growth and development of children and adolescents will be adversely affected. It is recommended to go to the hospital for further counseling.