This conversation has swung between homeopathy and chiropractic. It’s probably worth making a distinction between them.
There is some evidence that chiropractic can help with certain types of back pain. Beyond that, there is little evidence of any benefit. Certain manipulations near the neck are dangerous – people have died from them. NEVER let a chiropractor do a neck adjustment!
Homeopathy is nonsense. Withcraft. Voodoo. Beyond a placebo effect, homeopathy does absolutely nothing.
The best people to determine what works are scientist and researchers who understand the underlying science and undertake well-designed studies to measure the effectiveness of a treatment.