[zanpar321]

Some scientists found that people with PD who had been using levodopa for
some time had higher levels of homocysteine than newly-diagnosed PD
patients who had not begun treatment with levodopa. In another study,
using mice, researchers found that on a low-folate diet the mice had
increased levels of homocysteine. They speculate that increased
homocysteine can worsen oxidative stress on the neurons that produce
dopamine, and make them more easily damaged by environmental toxins.

Levodopa seems to hasten brain damage if B vitamins aren't supplemented!

http://forum.parkinson.org/index.php...nsons-disease/

http://www.researchgate.net/publicat...vodopa_therapy

http://neurotalk.psychcentral.com/sh...d.php?t=162193