Its not going to harm your liver, but its a complete waste of time and money dude. Your gains will be almost all water and you'll lose 90% of it in a week or 2. By the time your nuts are up and running, you'll be right back where you started (though you might get a nice pair of bitch titties to remember your awesome cycle by). And you're too young anyway. Fix your diet and training and there is no reason you can't pack on quality size quickly at 17.