I like the Taleb way to decide on these choices: if you have a very low return on a new medical thing (eg drug) and is supposed to use it often, the very tiny risk inside becomes actually quickly bigger than the benefit. On the opposite, even there is only 70% chance for it to work, go for the new heart surgery technique because if you don't you die anyway. (I am simplifying)

So in result: say no to antibacterial soap, say yes to whatever Doctor House prescribes you.