JetFuel is mainly designed for serious fat loss while preserving precious muscle. However, if you're primary goal is to build more muscle, simply take less per dose and use Jetfuel to amplify workout intensity, allowing more muscle fiber stimulation. JetFuel's incremental dosing structure allows those lighter in weight as well as persons bigger & heavier the ability to adjust dosages to their specific fat burning needs. Just remember, JetFuel is extremely aggressive and powerful. Be sure to read the entire label before ingesting and never exceed the daily recommended dosages.