Muscle Doctor BCAA Pro. BCAAs are everything you need to rebuild, repair and trigger lean muscle, growth, endurance and improved sports performance. It can be taken throughout the day and is especially useful intra-workout to speed recovery. It comes with 4:1:1 ratio of Leucine, Isolucine and Valine. Our products are of the purest and finest quality, undergoing several levels of testing at different stages, with more of good & none of bad – With years of experience, hundreds of Scientific-Athlete tests & several patents, we set new standards for the generations to come.