I saw mention of another study on google news today that Selenium and Vit E don't reduce chances of prostate cancer like previously expected and their was also a slight increased risk of getting prostate cancer from taking them so for men atleast, it may be a bad idea.
Also today I met someone that takes EDTA as a supplement they said they were always tired and this stuff changed that, so I been reading some interesting stuff about it like how it gets arsenic out your body that builds up from years of smoking. Also some people believe that smoking causes amalgam fillings to leak mecury in to your system, could be quackery I don't know, but EDTA is a proven treatment for getting heavy metals like lead and mercury out the body.
For me when I was using snus and at one time used copanhagen snuff that chewed my gums i found large doses of Vitamin C fixed that. These days I just take taurine and C mostly cause taurine is added to red bull to prevent the heart racing from too much caffeine and it definetly brings ones pulse down and blood pressure although i already have low blood pressure. No real reason for taking C i think it helps circulation aswell I worry way more about my heart stopping than cancer.