Australian and New Zealand Journal of Medicine
Ivan MacG. Donaldson
Volume 3, Issue 4, pages 413–416, August 1973
Summary: Two cases of progressive supranuclear palsy were treated for sever-al months with substantial doses of L-dopa. Both showed no significant response and continued to deteriorate while on this drug. Because of the sites of maximal involvement, and the extensive nature of the disease process, substantial improvement with L-dopa would seem less likely in this condition than in Parkinson's Disease. This is con-firmed by the few previously reported cases treated with this drug. The rate of progression of the disease would suggest that any response obtained would be of short term benefit only.
My comments: This study is based on only two cases. However other studies concur.
They variously found: In PSP cases it helps with the Parkinson's type symptoms at first.
On Parkinson's websites I see that some folk eat Broad Beans daily (same as Fava Beans) because they are very high in dopamines. They find it very helpful. But no more helpful than taking L-dopa in medication.
Funnily enough Broad Bean Flour is a great dough improver in bread making. The French have used it for hundreds of years at a rate of 2%. We have been using it for two years like that in our daily bake.
I am sure this isn't the last word on L-Dopa