I find that my body tends to be deficient in magnesium, especially before and during my period. I've been experimenting with different forms of magnesium to see which work best for my body. Enter my last period arriving with significant cramping and pain during a full day of social engagements. Out of desperation and with little faith, I popped a couple of these magnesium pills. To my complete surprise, my cramps eased significantly, disappeared, and haven't come back at all as I've been taking this magnesium daily. Usually I suffer from cramps for 5 days each cycle, so that is pretty amazing. I also tend to deal with leg aches and cramps at night and those have also vanished since taking this supplement. Highly recommend!