Have a look at Labdoor's magnesium supplement reviews,[1] but keep in mind that the supplement they gave the highest quality score, Life Extension Magnesium Cap

Have a look at Labdoor's magnesium supplement reviews,[1] but keep in mind that the supplement they gave the highest quality score, Life Extension Magnesium Caps, is not necessarily the best supplement. It contains magnesium oxide, citrate, succinate, lysinate, and glycinate, but seeing as they managed to squeeze 500 mg of elemental magnesium into one capsule that a human can swallow, it's probably mostly magnesium oxide and not much of the other forms. So I would steer clear of that one. Magnesium oxide is cheaper and less bulky than other supplemental forms of magnesium, but it is supposedly poorly absorbed. The other top Mg supplements on Labdoor's list look OK, and I use Doctor's Best Magnesium (glycinate/lycinate) myself. Examine.com has a great article on magnesium,[2] including descriptions of the various magnesium compounds used in supplements. Tl;dr: magnesium citrate is well absorbed and relatively cheap. There are other good forms, but they are usually more expensive. 1. https://labdoor.com/rankings/magnesium https://labdoor.com/rankings/magnesium 2. https://examine.com/supplements/magnesium/ https://examine.com/supplements/magnesium/