I suffer horrible leg cramps and had started taking this magnesium for treatment. It worked great! I ran out of the pills a few weeks ago and got lazy about reordering them, especially since I felt better than I have in a long time. But after a few days the pain came back with a vengeance and prevented me from getting good sleep. So I placed my order and waited a week in misery for the magnesium pills to arrive in the mail. Now that I'm back on them, my leg cramps are gone. Most people are deficient in this important mineral and should therefore be supplementing them in their diet. It's not easy to get enough magnesium naturally through your diet, especially since most food items, fruit and vegetables are not as nutrient rich as they once were. I also supplement with magnesium for treatment of my peripheral Neuropathy. I highly recommend this brand life extension