So I've been meaning to write this review for quite some time but just never got around to it for some reason or another. So this is overdue. This was one of those products I discovered by word of mouth. A friend of mine was telling a friend of his, who is an endurance biker that I ran alot and the biker guys recommended this stuff to me. What can I say about this stuff except that it has saved my cramping calves on more than one occasion. This stuff is basically electrolyte in pill form, but it is so much more. This stuff is great for long runs and race day, especially if it is hot (ie LA Marathon 2007). You can use the link below to get to the Hammer Nutrition site who manufactures this stuff. They mostly market to endurance biker but I figure what's good for the biker is also good for the runner. :) I mean just ask Lance! Hammer also makes this great energy gel that I also love and will review at a later time. I've shared these pills with my sisters on some of our long runs together and they are giving it the thumbs up. Honestly this stuff will help you out if nothing else at those dreaded last 6 miles on that big day. But if you plan to use this stuff on the big day, you should probably buy some and test it out on practice runs to make sure your stomach will not object to it. I have a very sensitive stomach and this stuff does not bother me but everyone is different.