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