Leucine is an essential amino acid, meaning that the body cannot produce it and must obtain it from food sources. It plays a crucial role in protein synthesis, helping to build and repair muscle tissue. Leucine is particularly important for athletes and those engaged in strength training, as it can aid in recovery and muscle growth. This amino acid is found in various protein-rich foods, such as meat, dairy products, eggs, and legumes. Additionally, leucine is often included in dietary supplements aimed at enhancing athletic performance and supporting muscle health. Its importance in nutrition makes it a key focus for those looking to optimize their diet.