Hi there. Mercury is locked in and bound up mostly and usually needs amalgam removal and provoking before it is available for detoxing via the skin. Though if it works? Great. But obviously your friend is getting nowhere and needs amalgam removal. His best bet at this stage would simply be a strict healthy candida diet, with healthy fats and proteins (butters, eggs, meats, olive oil etc) and good supplements.

Amalgam removal might begin to allow his stored mercury to start dumping back out. At this time, it seems he's not really achieving much, if anything. It may not be making him worse, but just might be pointless for him, as it seems it is.

I do not know if saunas encourage more vapor release from amalgams, due to the heat. It is possible of course, as any heat provokes more of it, but I would think that the sweating would probably offset that reaction. I can't be certain and this is why I would think it's wiser to wait until after amalgam removal before attempting to chelate (or chelate with sauna).