New information regarding the methylation cycle and MTHFR gene mutations seem to strongly suggest that PD can be treated by fixing this. Maybe throwing L-Dopa at the symptoms may no longer be the best we can do!
http://www.whfoods.com/genpage.php?tname=news&dbid=42
See also a study below showing a link between MTHFR and Parkinson's'
http://www.ncbi.nlm.nih.gov/pubmed/24064257
Folks with a MTHFR 677 or 1298 gene mutation don't absorb B12 and their methylation cycle needs fixing. Has anyone had any success doing this?