NeuroTalk Support Groups - Methylcobolamin and l-dopa toxicity

I think the following info from the Life Extension Foundation is a few years old.
I wonder if anyone has any experience with this.

Quote:

"At its current rate, Parkinson's disease strikes one in every 100 people over the age of 65. Almost every human suffers Parkinson's-like symptoms as they age. Methylcobalamin may help to prevent Parkinson's disease and slow the progression in those who already have it. Here's how:
Dopamine is a neurotransmitter that controls motor functions. Dopamine transmits messages through different regions of the brain and along nerve pathways in order to coordinate muscle movement.

Proper dopamine metabolism also is required to maintain a state of psychological well-being. Aging humans suffer a progressive disruption of dopamine metabolism that can cause muscle weakness, loss of coordination, and depression. Parkinson's disease is caused by the premature destruction of specialized brain cells that produce dopamine.