Ingredient

Isoleucine

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Source
Unknown
Not yet classified by editors
Allergen
No
Role in food
Isoleucine is primarily added to foods as a nutrient, specifically to boost the protein …

What it is

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.

Why it's used

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.

Health notes

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.

Allergen info

Isoleucine is not derived from any of the nine FDA major allergens. It does not contain gluten.

Products containing Isoleucine

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AQUARIUS Aquarius, Soft Drink Other Drinks 19kcal 0Protein 0Fat 4.7Carbs Advanced Food Concepts Inc. Energy Gel, Lemon Sublime Snack, Energy & Granola Bars 312kcal 0Protein 0Fat 71.9Carbs Reliance Vitamin, LLC Rich Chocolate Complete Protein Shake, Rich Chocolate Energy, Protein & Muscle Recovery Drinks 48kcal 6.1Protein 0.6Fat 3.9Carbs Reliance Vitamin, LLC Creamy Vanilla Bean Complete Protein Shake, Creamy Vanilla Bean Energy, Protein & Muscle Recovery Drinks 48kcal 6.1Protein 1.4Fat 2.7Carbs Advanced Food Concepts Inc. Chews, Watermelon Snack, Energy & Granola Bars 300kcal 0Protein 0Fat 76.7Carbs Reliance Vitamin Company Inc. Complete Plant Protein, Chocolate Energy, Protein & Muscle Recovery Drinks 45kcal 5.8Protein 0.6Fat 3.9Carbs Reliance Vitamin, LLC Rich Chocolate Shake, Rich Chocolate Energy, Protein & Muscle Recovery Drinks 48kcal 6.1Protein 0.6Fat 3.9Carbs Reliance Vitamin, LLC Rich Chocolate Shake, Rich Chocolate Energy, Protein & Muscle Recovery Drinks 48kcal 6.1Protein 0.6Fat 3.9Carbs Advanced Food Concepts Inc. Strawberry Banana Energy Gel, Strawberry Banana Snack, Energy & Granola Bars 312kcal 0Protein 0Fat 78.1Carbs Reliance Vitamin, LLC Plantfusion, Complete Plant Protein, Vanilla Bean, Vanilla Bean Chocolate 45kcal 5.5Protein 1.4Fat 2.7Carbs Advanced Food Concepts Inc. Salted Caramel Flavored Performance Food, Salted Caramel Snack, Energy & Granola Bars 312kcal 0Protein 0Fat 68.8Carbs Advanced Food Concepts Inc. Chocolate Outrage Flavored Energy Gel Performance Food, Chocolate Outrage Snack, Energy & Granola Bars 312kcal 0Protein 4.7Fat 65.6Carbs

Last updated: September 28, 2026

Note: This site presents label data from USDA FoodData Central for general information. It is not medical advice. Check the package label; formulations change.