What Is Magnesium?
Magnesium is an essential mineral predominantly found in the body within cells, where it is vital for their functions.
Here is a summary of what magnesium does in our body:
- Co-factor for over 300 enzymes involved in the metabolism of food components and synthesis of many compounds.
- Required for nerve transmission.
- Required for muscle activity (acts to relax muscles in opposition to calcium  which acts to contract).
- Acts to maintain heart rhythm.
- Required for membrane transport and interactions.
- Required for glucose  metabolism and energy production within cells.
- Component of bone mineralization and tooth formation.
- Plays a key role in calcium  and phosphorus  metabolism and management by parathyroid hormone.
- Maintains the structural and functional integrity of vital eye tissues such as lens.1 
Only 1% of magnesium is found in blood, but the body must keep blood levels of magnesium constant.
What Is Magnesium Deficiency In Celiac Disease and/or Gluten Sensitivity?
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Agarwal R, Iezhitsa I, Agarwal P, Spasov A. Magnesium deficiency: does it have a role to play in cataractogenesis? Exp Eye Res. 2012 Aug; 101:82-9. doi: 10.1016/j.exer.2012.05.008. ↩