We have earlier written about whether energy healing and dowsing are permissible according to the Torah here.
To quote:
“Not to Pasken, of course, but my own basic assumption on all these questions, contrary to others, is that everything is permissible unless it falls under some problematic rubric…
And the fact Avoda Zara was formerly given credit for certain effects is irrelevant. Does anyone doubt electricity would also have been attributed to Avoda Zara if it had been known\sytemized by idolaters? Electricity isn’t well-understood, either, so why is the one “natural” and the other “supernatural”?”
I recently briefly came across “Alternative Medicine in Halacha” by Rabbi Rephoel Szmerla who makes the same point. He quotes Chochmas Adam 89:3, Shevet Halevi 5:55, and others (regarding homeopathy), who write that a process need not be comprehensible for it to be permissible.
This is not to agree with the proofs he gives for the efficacy and/or Torah endorsement and Heter for various treatments.
I also disagree with his description of skeptics as closet/incipient “heretics” (see the pamphlet here on p. 10).