"I takes what I takes 'cause I can'ts takes no more!" - Popeye (sorta')
I take the ones listed (most of the time) either because of common sense (i.e. multivitamin), research I trust (i.e. green tea extract), or self-experiment (i.e. lipoic-carnitine combo). For each one I take there are two I tried and rejected.
I agree with TenaL more often than not. Even colloidal silver does seem to have some things going for it in other settings (which is one reason I wish I could see the research - I'm ready to believe.). It is just that, with all I've read, this is one I haven't run across before.