Theyarethemiraclepillsthatshouldn'treallyworkatall.Placeboscomeinallshapesandsizes,buttheycontainnoactiveingredient.Nowtheyarebeingshowntohelptreatpain,depressionandevenalleviatesomeofthesymptomsofParkinson'sdisease.Horizonexploreswhytheywork,andhowwecouldallbenefitfromthehiddenpoweroftheplacebo.
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