Oh ya, it is, you will notice it right away, don’t take it right before bed or you lay there wide awake, not feeling bad, but feeling great, Mag = Energy, this stuff is totally awesome. I damn near died from lack of Magnesium. Your blood levels won’t reveal low mag becasue your body will pull it from your bones and muscle otherwise you’d be dead, meanwhile, your body is absolutely starving and your heart contracts and cannot relax or vise versa and you die from a heart attack, which all too often is nothing more than a lack of Magnesium.
Oh, by the way, you can buy it at Whole Foods stores, that’s where I get mine.