IMO the main problem with all those supps. is that if your diet is shit its not gonna do anything. On the other hand if your eating is clean you might have a chance putting on some size with them. Also genetics play a very large role in all this...

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age-20
6'0" 190lbs
bench press-245x2
a2g squats-455x1-9/7/06
deadlift-475x1-9/5/06

"An ounce of prevention beats a pound of cure."