After reading a few of the posts, I was quite suprised that the number 1 used method for natural/non-invasive procedures was not discussed.
Chiropractic - is a health care discipline and profession that emphasizes diagnosis, treatment and prevention of mechanical disorders of the musculoskeletal system, especially the spine, under the hypothesis that these disorders affect general health via the nervous system. Wikipedia
Patient satisfactions - The study, which surveyed more than 14,000 consumers, was conducted by the Consumer Reports Health Ratings Center. The report states that, “ eighty-eight percent of those who tried chiropractic manipulation said it helped a lot, and 59 percent were ‘completely’ or ‘very’ satisfied with their chiropractor.”