I get really bad cramps, more so during these latter years. These pills are 100% effective. They are fast-acting, and last a while. I usually only have to take two a day and I'll be fine. They're a good price, certainly better than other products that are the same. Honestly I've tried heat pads, ice, Tylenol, etc., and none of them work. These however are awesome and I will keep repurchasing!