The placebo effect is pretty damn awesome; fixes all kinds of things and doesn't have any bad side-effects like those drugs you get (or at least none that we've found so far). And a few years ago they demonstrated that even if you knew you were receiving the non-effective sugar pill somehow it still seems to work. Maybe it's just the effect of doing something non-harmful because of the problem you're having makes you body feel better about fixing it itself, or something like that. So with all these things like mindfulness and homeopathy, the important thing to check is that it doesn't have any bad effect intrinsically, and that nobody's getting inordinately rich from peddling snake oil, and it doesn't cause the ice caps to melt, and you're good basically.