I don't think xtend is advertised as a strength or size builder, is it?
Tribulus should be standardized to at least 80% sapiens...you're 17 anyway. You wouldn't have noticed anything except for possibly a boost in libido. I don't blame you though..I would take it too if it was free.
Vaso charge looks ok as far as ingredients go...minus the arginine and caffeine. Did you feel like you were going to pass out after you stopped taking it and were lifting heavy? I'm caffeine sensitive too...can't have anything like that after about 2-3:00 myself. Sucks, doesn't it?