I do take calicum and potasium, I'm going to add magnesium to the mix. The leg cramps are due to muscle fatigue, I have Fibromyalgia and because I now have to work standing on my feet 8 hours a day on concrete my legs are beginning to cramp and ache badly not only during the day but at night too.
A calcium magnesium is better for you than a calcium potasium mix. Be sure you're getting enough water and wear good supportive shoes.
Enzymatic Therapy carries a line of products for people with fibromyalgia (sp), Fatigued to Fantastic, they have information on a doctor on line website but I'll have to find the address and get back to you on it.
I'm sorry you're not well and I hope you feel better soon.