If the Placebo effect works then don't argue! Just be glad that whatever the problem was is gone and don't question. I suck ginger sweets to ward of travel sickness and they work, although the high sugar content should, in theory, mitigate the effects of the ginger!
I'm not too sure about homeopathy, but some other alternative therapies seem to be very good, especially accupuncture. You never can tell what will work or not for you!