Here's some things to try that are natural: Extra zinc, echinachea, Astralagus, Folic Acid, Vitamin C, Pycnogenol, Green Tea Extract, glutamine, Bitter Melon, Aloe Vera Juice. There are others, but I can't hink of them offhand.
Grape juice isn't the same as Dextrose. Grape Juice has a glycemic index of 59, and Dextrose has a GI rating of 100, and is what the scale is based on.
l-dopa makes your brain create more dopamine. An overabundance of dopamine is what plaques schizophrenics, which is why l-dopa can cause psychosis. If you use the Murcurna (sp?) bean extract form, be sure to take it on an empty stomach or it won't absorb. Best time is at bedtime.