Leucine
CautionAmino Acid
Leucine is an essential amino acid important for protein synthesis and muscle repair, found in both animal and plant sources.
What is Leucine?
Leucine is one of the nine essential amino acids that the human body cannot produce on its own, thus it must be obtained through diet. It plays a crucial role in protein synthesis and muscle repair, making it particularly important for athletes and bodybuilders. Leucine can be sourced from both animal products, such as meat and dairy, and plant-based foods, like soybeans and legumes.
Also known as:
Unsure about an ingredient? Scan it instantly.
Try SpoonfulDiet Compatibility
Leucine is an amino acid that can come from either animal or plant sources. If the label does not provide a source, we recommend calling the manufacturer.
Learn more →Leucine is an amino acid that can come from either animal or plant sources. If the label does not provide a source, we recommend calling the manufacturer.
Learn more →Leucine is an amino acid that can come from either animal or plant sources. If the label does not provide a source, we recommend calling the manufacturer.
Learn more →This ingredient is generally considered compatible with a Dairy Free diet.
Learn more →This ingredient is generally considered compatible with a Gluten Free diet.
Learn more →This ingredient is generally considered compatible with a Fodmap diet.
Learn more →Compatibility ratings are general guidelines and may vary by individual. Always consult a healthcare professional for personalized dietary advice.
Why People Avoid Leucine
Vegans might avoid leucine if its source is unclear, as it can be derived from animal products. If the label does not specify whether the leucine is plant-based, it is advised to contact the manufacturer for clarification. Some people might also avoid leucine due to potential allergies or intolerances.
Potential Reactions
- Allergic reactions
This information is for educational purposes only and should not be considered medical advice. Individual reactions can vary. Consult a healthcare professional if you have concerns about specific ingredients.
Spoonful flags ingredients that don't match your diet.
Get the AppFoods That Commonly Contain Leucine
Browse products that match your diet.
Explore ProductsFrequently Asked Questions
Your Personal Ingredient Scanner
Spoonful helps thousands of people with dietary restrictions shop safely. Scan barcodes, read labels, and find safe alternatives — all in one app.

Take the Guesswork Out of Grocery Shopping
Join thousands who use Spoonful to find foods that match their dietary needs.