1These levels of heavy metals are very low. Heavy metals has not been proven to be totally unneeded by humans, other animals or plants.
What are you refering to, to judge that these levels are high?
Plus, these are in a non-organic form, and will be extremely poorly absorbed. It is absorbed the best if it is organic, such as methylmercury, and heavy metals can be methylated by the intestinal flora. I also believe that the better the intestinal flora is, the less mercury you'll absorb.