Isoleucine

Isoleucine is one of the nine essential amino acids, meaning the human body cannot produce it and it must be obtained from food. It is found naturally in many protein-rich foods like meat, poultry, fish, eggs, dairy products, and legumes. It can also be produced industrially through fermentation processes using microorganisms.

Isoleucine is primarily added to foods as a nutrient, specifically to boost the protein content. It is often found in sports nutrition products like energy drinks, protein shakes, and bars, as well as in some meal replacement products. Its role is to support muscle growth and repair.

Isoleucine is generally recognized as safe (GRAS) by the FDA when used as a nutrient. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated amino acids, and they are considered safe when consumed as part of a balanced diet. Research suggests that essential amino acids like isoleucine play a vital role in muscle protein synthesis and energy metabolism. Evidence does not suggest adverse health effects from typical dietary intake.