Im a 19 yr old male. i am going to the army. i wanna gain muscle mass fast. suggestions on supplements or medications?

Muscle mass: As long as you are otherwise healthy, you can see a certified personal trainer at a gym who will create a workout program to match your needs. Muscle fibers increase through weight lifting, even a small pair of dumb bells can work. Do this under guidance and above all accept yourself the way you are while working on this goal. Peace and good health.