I started taking the Calcium, Magnesium, Potassium tablets when I was having very severe leg and foot cramps. I was told that since I took a dieuretic (Lasix) for my blood pressure that I needed to take more potassium to counteract it. I went online to Puritan's Pride web site and checked out the different vitamin supplements. It said that people who used medication for heart related problems and high blood pressure to alleviate puffiness due to water retention it sometimes caused you to have a deficiency in potassium. Potassium is necessary keep a normal water balance between the cells and body fluids. Potassium also plays an essential role in the response of nerves to stimulation and in the contraction of muscles. That's why I was having the severe cramping.
Since I have been taking the supplement, I have hardly any foot or leg cramps any more. It didn't take a long time to see the difference. The calcium was necessary for lack of bone density as we grow older and the magnesium helps when one is diabetic as well, so I thought the combination would be good.
The price listed above is for 100 - 500 mg. tablets. You need to take 2 per day. The price is 50% off at this time. I sometimes can get 2 and then get 2 free. Puritan's Pride has really good deals.