Muscle Cramp Remedies

I have some friends who suffer from leg cramps at night. I subscribe to Health & Healing and and found an article about the cramps and a cure that works. It said to keep a bar of "Ivory" soap on your nightstand and when the cramps come, just rub the soap bar on the leg and the cramps will go away very quickly. I told my friends about it and they tried it and said it works. In the article Dr. Whitaker said he doesn't know why it works but it does.