Well first you want to make sure to be following a consistent resistance training program that applies progressive overload i.e. lifting heavier weights and or adding more reps to your exercises. Get enough sleep to optimise recovery and eating in a small caloric surplus of 200-300 calories so you have the resources to BUILD muscle. NOW adding in the proper supplements can take your gains to the next level. Here is a list of the LEGIT supplements that will help you make gains in the gym. ~ Berceste