I'm a 19 yr old male. I am going to the army. I wanna gain muscle mass fast. Suggestions on supplements or medications?

Eat, sleep, workout. With 24 years on active duty and having both attended west point as a cadet and provided the orthopaedic care of of the cadets for the past decade before retiring, i speak from experience when i tell you, that you do not need to take any supplements or medications to be ready to join the army as a soldier. Sleep and eat well, and workout regularly. As a healthy 19 year old, you will be ready.