I also believe in Placebo & Nocebo effect. But that, too, is about energy. Who believes what? Even what your DOCTOR believes can affect YOUR healing. Thoughts are energy... I read a book on these effects. Some people 'need' injections to heal because the believe in the 'magic' of an injection. Some people 'need' surgery. They even did placebo-surgery on not life-threathening occasions such as knee-pain (make an incision and close the wound), and the patients got better, exactly like the people who got the 'real' surgery.
So everyone believes in something. And the magic of a healing hand or thought is not MORE magic than the magic of an injection, homeopathy or surgery.