VivaSlimNext, Simple Promise VivaSlim has many amino acids in its ingredients list, which help build lean mass and lose fat. According to some studies, the branched-chain amino acids (BCAAs) used with vitamin B6 can affect fat breakdown, muscle growth, and lean mass gains. But for that, they need a higher amount of BCAAs, which is impossible to get from dietary sources alone. Hence taking help from a supplement may increase the amino acid intake, making it easier for the body to avail all these benefits.