Whether it’s due to diet or a health problem like diabetes, you could be magnesium deficient for a variety of reasons. MagOx 400 Magnesium is a highly concentrated magnesium supplement. These magnesium oxide tablets are doctor recommended to correct magnesium deficiency symptoms, such as fatigue, migraines and cramping. MagOx is free of gluten and sugar, so you can absorb this essential mineral without aggravating any other health conditions.