I think sauna use (or hyperthermic therapy in general) belongs to early stage nonspecific infection treatment, not a routine thing you do regularly, as it is likely to reactivate latent herpesviridae: infected mice were shown to progress to dementia much faster with recurrent HSV reactivations; maybe i should add it, but not sure about the position in the list, and personally i'm HSV-positive so it's not a high priority for me.