Bernie is right. It only clears the blood and extracellular space, like
DMPS and DMSA, but if an adult sweats out a quart or two of sweat a day it
is the same as using 100-200 mg DMSA every 4 hours that day.
It clears a lot of other things, too, and it turns out sweat is the major
route nickel takes on its way out of the body.
REGULAR saunas are excellent for nickel and somewhat helpful for
mercury. I don't know about the other metals.
Infrared saunas are dangerous and harmful for mercury toxic people and
should not be used. There is an incredible amount of hype about using
them for detox nowadays, so if the doc is talking about infrared
sauna, there is no legitimate technical basis behind his suggestions.