You really need to find the correct dose for you. If you are getting bloating, gas or cramps then you may be taking too much. Its best to start slow and up the dose gradually so that you can see when you've past the comfort zone for your particular case. We all react differently and the dose that may work for me may be too much for you.

Hedgehogbum and kingfish how are you both I just started taking magnesium oxide it worked then it didn't work so I brought some magnesium citrate powder and will start taking it if these oxide pills don't start working again