Interesting question. A few short weeks ago I would have said no and that believing in such things was a case of the placebo effect. But I found myself recently in a state I nearly hospitalised myself for. My Pdoc was unable to meet with me so he actually prescribed that I use a more natural remedy to dealing with my anxiety: Lavender, and 'stress release' (name brand) oil, and a name brand tea (PM me because I don't think we are allowed to flog products). I noticed an immediate relief of my symptoms and have managed to keep the severe anxiety mostly at bay. I applied for a job yesterday which weeks ago I wouldn't even have considered. I am very thankful for the discovery.