Hijacking top comment for a basic PSA in human metabolism: Testosterone is an anabolic steroid so it will make it easier to pack on muscle BUT to say it makes it easier to "gain weight" comes dangerously close to the fatlogic hams like to spout about their medications or "muh set point" justifying their fattening and inability to return to humanity. Even steroid users know they need to work out harder to see any results. CICO is king, no one can out-exercise a diet of beetus or too many calories. This applies to everyone, no matter how hard the pigs squeal otherwise.