no. i don't think so. it may up your natural aggressiveness though.. nothing huge. Some people are just assholes, and use it as an excuse to be an even bigger asshole.
on test, you should feel a greater sense of well-being, and you'll probably sleep better and a slew of other things.. search
i'm actually in a better mood overall on test than not. confidence is good. and, suprisingly, my temper is much more even and I don't get mad nearly as easily, but then again, it may just be a result of a higher overall sense of well-being. all is good.
Well, i can only speak for myself. Whether i'm on or not I'm still that same handsome, charming, likeable guy of always been. That's just me though..... Mr Invinsible has spoken.