Andy Cutler lauds saunas as ways to remove extracellular mercury. And there's a widespread belief that saunas and sweating remove 'toxins.'

Yet I can't really find any real research that backs this up besides assertions. In fact, many argue that the body simply does not remove impurities via sweating.

Does anyone here have any good research or evidence that saunas really can remove heavy metals, PCBs, etc etc?