I can tell you an example. you can call it placebo or whatever. a couple of years ago I had a problem in my knee caps. it hurt a lot when I was walking. at first I didn't want to go to a doctor, because I hate to take pills, but after a couple of days later since I couldn't bear the pain. I went to a doctor. he checked my knee caps and gave me some pills, but it didn't cure my knee caps, then I went to another one. he couldn't even cure it, then my mom told me to go to this doctor who practices the traditional medicine. he gave me some oil, and told me what to do in home.what I have done was massage my knee cap with a soaked blanket with mild hot water, and apply the oil that he gave me, and bandage the knee cap a bit tight, I did it everyday twice per day. after a couple of weeks later. my knee caps were cured. :)