Understood, but things like fluoride really should be avoided, certain pet numbers on bottles are to be avoided, but most of the "naughtier" ones have mostly been phased out to the best of my knowledge.
NO Xplode and the like, short term training boosts used for no longer than two weeks at a time, but again, read the labels, even if you've read them before, ingredients change, and Aspartame sneaks in everywhere.
Re the amount of chemicals, many chemicals interfere (inter fear) with the correct function of the human body, the mechanisms that make us work mentally and physically are pretty finely balanced, the amount of excess crap you shove in your body WILL interfere in it's correct function, and in some people this can have an even more profound affect (you can't rule YOU out of this category) so this is not about long term my friend, this is very much about the now!