take a creatine if u want size unless u wanna go the ph route and run something like mdrol. i know our day and age, ppl think u need supplements to get big but u really dont. i take supplements but i know i dont need them. just eat alot. go heavy on bench, squat, deadlift and barbell rows. this will increase testosterone throughout your body, especially squats and deads. eat alot of carbs if you are looking to bulk. i am against bsn, especially true mass cause its expensive for what is in it and how many servings you get. iso mass is amazing, so is serious mass. everybody on here as well as myself will suggest either make your own weight gainer or do a mix. i do 1 scoop of serious mass along with oatmeal oats, flaxseed, strawberries, 1 banana, ice cream and 2 eggs. this gives me about 70 g of protein, 200 - 250 g of carbs, all my vitamins for the day and about 1600 calories. good luck!