Thanks for answering. I'm a little confused about brewers yeast now because I read that it is grown on grains and nutritional yeast is grown on molasses (?).
Also, what do you think about clothes? I know that cotton is one of the most pesticide-laden of all the crops out there, so I prefer to use organic cotton (hemp,wool) material for clothing. Stands to reason that these pesticides from non-organic cotton can get in our skin too, right? Not to mention the potential contaminants from the finishing chemicals and dyes in the processing.