A recent study in which subjects had 200mg 2x daily of caffeine for 3 weeks ( at morning and lunch so as not to effect sleep) showed that it had motor benefits and helped with "freezing" and rigidity in Parkinsons patients.
In an article accompanying these findings it was noted that a study was conducted 40 years ago that found benefits of combining Caffeine with Levadopa, but the dose was too high (about 1100mgs per day) bringing on dyskinesia, At lower doses caffeine does appear to have benefits without negative effects,
This article also stated that caffeine may have a protective effect against Parkinsons.
All this is great news....because I have just put on a pot of Hazelnut Creme Coffee! Join me in a cup?