fulvic and humic acids in the soils allow the plants to uptake minerals form the soils. the acids chelate (ie bind) to the minerals and this allows the plants to uptake the substance. healthy soil has his fulvic and humic acid content and thus creates highly mineralized plants, unhealthy soil is the opposite.
the human body is the same way, we have a limited ability to uptake elemental minerals, but when they are chelated (ie bound to an acid) then its much easier for our body to uptake the minerals.
however, JAB brings up a good point. with this Miracle-Mineral-Supplement stuff it doens't sound like you are trying to uptake the minerals, rather you are trying to let that compound do its thing in your body. thus its a good idea to take anti oxidents at a different time than you take the Miracle-Mineral-Supplement .