Leucine may help in preventing age-related muscle loss and a stronger immune system.
Leucine is one of the 8 essential amino acids, which means you must take in regular amounts of this nutrient from food because your body cannot produce it without certain foods.

Soy protein
Organic skimmed milk
Whole wheat bread
Organic chicken breast
Raw peanuts
Greek yogurt
Organic eggs
Parmesan Cheese
Sesame seeds
Gruyere Cheese