Magnesium Oxide

Magnesium oxide is defined by density.

It contains a high proportion of elemental magnesium by weight,
but its absorption profile is limited.

At a high level, evaluation comes down to three signals:

• Elemental content vs absorption — high theoretical content, low effective uptake
• Solubility — limited dissolution in physiological conditions
• Osmotic effect — strong impact on intestinal water balance

Oxide often appears as a cost-efficient source of magnesium.

Its presence can inflate label numbers without proportionally increasing usable intake.

Quantity does not equal availability.
Form determines what is actually delivered.