I have used animal pump, for months without a problem, however, and this is nothing to do with my pre workout ,just thought I would share this, I was using a multi vit called reflex ,when for some reason I couldn't get animal pak (the multivitamin) in the UK for a period. Well I wished I had waited for animal to get back in stock. as I had just finished training legs,doing a very intense workout, and I get an extremely painful one sided headache and a nose bleed.
Scared the shyt out of me. My workout partner when he heard asked if he could have the rest of the reflex pack despite me warning him about what it almost certainly did to me (as I was fine after I stopped taking it) so he took it,and while he didn't get the bad headache and nose bleed, he had nausea so bad he had to stop taking it.
Another load of shyt, is that so called buffered creatine krealkyln, doesn't bloat you they say,easier on the stomach they say , .... well it bloated me the fukk up, despite me following the directions to a T, and not only that I got some kind of weird stomach/bladder problem as well Again someone else in gym wanted to try it, gave it to them,they got the shyts real bad.
I find anything made by 'animal' is really good quality if a bit expensive for what you get at times... but it does what it claims on the tin. Even their natural hormone animal stak , and mstak protein thingmjig, you get results from that. I wouldn't use any other brand these days.and I will be using them until I plateau in the gym,then I will look at 'unnatural' options.