<p>Theyarethemiraclepillsthatshouldn'treallyworkatall.Placeboscomeinallshapesandsizes,buttheycontainnoactiveingredient.Nowtheyarebeingshowntohelptreatpain,depressionandevenalleviatesomeofthesymptomsofParkinson'sdisease.Horizonexploreswhytheywork,andhowwecouldallbenefitfromthehiddenpoweroftheplacebo.</p>
