I got the info on fava beans from the parkinson's forum by Aunt Bean ... this is what I have been doing dont know if it would help you or not but might be worth trying

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I have been eating about a 1/4 cup of fava beans (canned ones from Progresso) as they are the only ones I can find. But the tremors and jerking of my leg have calmed some. Dr. poo pooed it as I started on the beans about same time as the Keppra I was on would have been cleaned out of my system. I had went 11 days without a major cramping spell from the myoclonus... so to see if it was just being off the keppra or if the favas had a part I quit the favas and my leg started going again like before...so I am back on fava beans and I dont care how silly my doctor thinks I am.