I'm kind of an expert (sort of) in magnesium and will share a few things. If your IBS was managed by Magnesium, than your underlying problem was really a Mag. deficiency, which can be a very complex issue. Very. Magnesium does have a very profound and direct effect on the intestines, and on other aspects of digestion too. If you have bowel trouble and haven't tried Mag. you certainly should. That"s #1 on the first things to try list. As far as forms go, if you tend to have low stomach acid, or have trouble digesting food than look for the citrate form. But among Mag Citrate, there is one product that stands above them all in terms of absorbablity. It is a product called Natural Calm. You will absorb 100% of what you take of that product. (It's Magnesium Citrate in powder form that you dissolve in water.) This is not necessarily true of Mag Citrate in pill form. Also, someone mentioned Magnesium oil, which is an amazing product. It is Magnesium chloride, and you actually apply it to your skin, and you absorb it transdermally . It works very well, and has the added benefit of largely bypassing you digestive tract, and thus doesn't really have such an immediate laxative affect. You can also take Magnesium internally, and also apply the Magnesium oil topically ... and get Magnesium into you through both routes. From time to time, someone will 'up' their Magnesium levels and have a nearly miraculous response, as it looks like the original poster in this thread is experiencing. Good for them. For me, Magnesium actually did not cure me. In fact, I found it too disruptive of my intestinal function, and caused me too become fatigued. I now just use the Magnesium oil. If you suffer from fatigue, do not take too much Magnesium, or you'll get more tired, as it will relax you too much. If you are new to Magnesium, start with Natural Calm, as it is in a league of it's own in terms of absorbability. Good Luck.