They are the miracle pills that shouldn't really work at all. Placebos come in all shapes and sizes, but they contain no active ingredient. Now they are being shown to help treat pain, depression and even alleviate some of the symptoms of Parkinson's disease. Horizon explores why they work, and how we could all benefit from the hidden power of the placebo.
Maggie Nichols Gina Nichols John Nichols Steve Berta Marisa Kwiatkowski Mark Alesia Rachael Denhollander Jessica Howard Jamie Dantzscher John Manly Tim Evans Jennifer Sey Géza Poszar Tracee Talavera Mike Jacki 纳迪娅·科马内奇 Béla Károlyi Mary Lou Retton Kerri S
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