Painful foot cramp can derail any run – so here’s what causes it and, importantly, how to stop it from happening in the first place ...

In this edition of The People’s Pharmacy, Joe and Teresa Graedon also hear from a reader who asks what type of magnesium is recommended for migraines.

Q. Occasionally I experience debilitating leg cramps. Since reading about sugar-free tonic water, I’ve been drinking that.