The best replacement for magnesium oxide is citrate.

The best alternatives to magnesium oxide are rated as following:
★★★★★  citrate
★★★★  magnesium citrate
★★★  magnesium chloride
★★  magnesium
★★  magnesium gluconate
★  magnesium glycinate
★  magnesium hydroxide
★  glycinate
★  chelated
★  magnesium sulfate
★  chloride
★  magnesium taurate
★  magnesium aspartate
★  magnesium lactate
  hydroxide
  magnesium oxygen
  slow mag
  magnesium chelate
  aspartate
  malate
  gluconate
  magnesium malate
  magnesium stearate
  chelated magnesium
  magnesium carbonate
  elemental magnesium

Your alternative for magnesium oxide is not listed? Suggest!
Speaking about magnesium oxide, one probably shouldn't forget about hydrogen peroxide.

Other search terms related to magnesium oxide and their ratings are:
★★★★★ hydrogen peroxide
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magnesium oxide
citrate
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