ATP Science BCAA 2:1:1Non GMO 3rd Party Assay Tested Vegan This tub is full of a combination of 3 amino acids; leucine, isoleucine, and valine in the ratios of 2: 1: 1. BCAAs are used to help build lean muscle mass and stop muscle breakdown (catabolic activity). Support your Performance and Recovery High quality 100% plant based BCAAs ATP Science BCAAs are all natural, unflavoured, therefore containing NO artificial colours, flavours, or preservatives.