Papaya and pineapple have some qualities simular, but the papaya has been proven to work for PD (the last Pope even used it with success). For me It has improved my eyes. It took away my nitetime symptoms of bent over/ drag right foot sideways/ my left hand in front of me bent in "begging puppy possition with right hand kind of flailing trying to keep my balance....daytimes I use tincture of fava tops and do fine, but don't take it after 9:30 when I go to bed.