Threonine is an essential amino acid, meaning that it cannot be produced by the body and must be obtained through diet. It plays a role in protein formation, enzyme activation, and helps regulate metabolism. Threonine is widely used in dietary supplements and is found in many food sources such as dairy, meat, eggs, and legumes. Threonine has been linked to improved immune system functioning, better digestion and absorption of nutrients, and is important for healthy growth in children. It also helps protect against cardiovascular disease, cancer, and autoimmune diseases. By including threonine in our diets, we can ensure that our bodies are getting the nutrients they need for optimal health.