There are so many types of magnesium out there, and keeping them all straight can get dizzying! Here is a full-on review of the different types of magnesium (Mg) and what they're used for: Magnesium Oxide (aka Milk of Magnesia) - this type of Mg has a laxative effect. It is not very well absorbed in the body (only about 5% is absorbed), so it can often lead to side effects of bloating and diarrhea. **Magnesium Citrate - this has a laxative effect as well, but it is much more