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Science series. Horizon explores why placebos work, despite containing no active ingredient, and explains how we could all benefit from their hidden power.

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.

First shown: 17 Feb 2014
Expires tonight 8pm Why? Last Chance Duration 60 mins