Levo-dihydoxy-phenylalanine (L-dopa), the amino acid precursor of dopamine, was first used to treat Parkinson's disease (brain catecholamine neurochemistry). Phenylalanine, I think, is better known as Nutra Sweet. Has there ever been a discussion about this artificial sweetener in PD diet--good or bad? Time to go mine the archives? ............................................................................................ Ray Strand mailto:[log in to unmask] ............................................................................................ ...on the edge of the prairie abyss ......................