The most important difference when you're looking for a magnesium supplement is to avoid what's called the inorganic forms... Like magnesium oxide or magnesium sulfate, like they're just not very bioavailable ... So magnesium citrate, magnesium malate, magnesium glycinate, magnesium taurate. These are all forms of magnesium that are relatively the same in terms of their bioavailability. I personally like taking magnesium glycinate.