I have developed tolerance so I need take 1500mg of niacin to flush before sitting in the 180 degree sauna for 60 minutes. That is a very intense combination of two extreme burning hots which requires drinking nearly a gallon of salt water during the bake.
I do this at least once a week sometimes as many as three times a week when I have the extra time. It is good for detox especially Hg and is perfectly safe unlike the dangers posed by careless and dangerous chelating which has cased permanent damage to some. I recently had all my fillings removed.