Leucine

BCAAs, especially leucine, stimulate muscle protein synthesis (MPS) via the mTOR pathway, aiding muscle growth and repair. This process is enhanced by adequate protein intake and resistance exercise.

BCAAs reduce muscle breakdown (catabolism) during calorie restriction or intense exercise by providing an alternative energy source and stimulating protein synthesis. This helps preserve muscle mass and supports recovery.

Muscle mass increases when resistance training is combined with sufficient amino acids, particularly essential amino acids, to fuel muscle protein synthesis. This leads to repair and growth of muscle fibers, enhancing strength and lean body mass.