dear Mari
i too have had twitching in the past. i figured it was probably a magnesium thing after caving to a prolonged milk craving - [I]and then realizing hey! it's
stopped. and that time it had got much worse than other spells - both eyes, almost all the time, and larger muscles (glut, thigh, i couldn't even sit comfortably sheesh!)
didn't know about the potassium but good to know.
i also get leg cramping in the morning sometimes when it is bad, and magnesium fixes that.
i take effervescent supplemtents of
--
mag + potassium (here given as a rehydration supplement)
having run out of that i now take
-- effervescent mag b1+b2+b6
i will have to look up your beans. the effervescent tabs i mentioned were bought "accidentally" by mom, and have yucky sweeteners in them. i am "finishing them off" before getting better ones because supplements are so expensive.
i hope the twitching stops soon. it is so annoying.
Hi Rrrae!! 
MrsD what lovely snowdrops!
~ waves ~