I am prone to leg cramps as well. Also, I get restless leg syndrome. I have found that increasing the minerals in general helps. All that water seems to flush them out. If you do just take the potasium and calcium, remember to balance the calcium out with magnesium. It is also a muscle relaxant. I just go with a "multi-mineral" formula I got at my vitamin store.

I find that if I get up and take two pills when the cramps or twitching starts it will subside in 15-20 minutes. Hope this helps.