B vitamins are getting my attention lately, though riboflavin has not been on my radar until now. B12 has been, along with B6. All of course vital for the nervous system. NWPF has dietary advice on B12 & folate for people taking l-dopa in the long term. Also found this

http://www.hbi.ucalgary.ca/news-stor...pamine-dilemma

which seems to suggest that supplementation with cobalamin (a form of B12) may be useful in a type of peripheral neuropathy that may be induced by long term levodopa usage.

Slightly off topic I know, but maybe connected?

Lindy