Magnesium Citrate has a high stability constant. It is due to this high stability constant that it may not be available intracellulary. Most of the work done by magnesium is a result of it being intracellular. As a result, magnesium citrate is poorly retained. The majority of absorbed magnesium citrate is excreted intact via the kidneys. In addition magnesium citrate gas a high laxation effect on the gut. If you want to take a magnesium that is good for your health, magnesium citrate is not for you.