BioTechUSA BCAA Flash Zero The 3 most important "muscle amino acids" leucine, isoleucine and valine (BCAAs for short) are by far the most popular and most effective amino acids in the fields of weight training, bodybuilding, martial arts and endurance. No wonder, because the BCAAS make up about 35% of the muscle protein. We have also added Vitamin B6 to the product, which contributes to normal protein and glycogen metabolism, as well as to reducing tiredness and fatigue. Comes in watermelon flavour and in 360 g jar.