5 days a week all sets to failure is too much, go one on one off, two on one off w/the routine I refered to previous, you have a little enemy called cortisol that when too stressed (when the body is too stressed) floods the body and canablizes muscle, the one off one on two off one on is as much about hormones as tissue growth, your body needs adequite time to replenish anablic hormones and again overtraing stimulates destructive hormones, relax and rest and eattwo three +days a week, it will be like your on juice, my bros swore I was juicen all my life, I didn't start until o couple of years ago, more out of lack of time to train to meet my goals than anything else, I am 40 yrs. old started BB when I was 14, dude, you dont need chemicals,
not yet anyway, your 5'8 and 160 not bad for 5'8 so you are at least a endomorph, (look it up if you don't know) just rember protien - vitimans for hormone synthesis, PLENTY of rest