BCAAs include three essential amino acids: valine, leucine and isoleucine — all of which have a branched chemical structure
The supplements typically supply twice as much leucine than isoleucine or valine, which is sometimes referred to as a 2:1:1 ratio. This is because leucine may be especially good at stimulating protein synthesis and suppressing the breakdown of muscle protein
Take during exercise
Taking BCAAs during workouts has been studied a little in endurance training, such as distance running and cycling.