Approximately 50% of total body magnesium is found in bone. The other half is found predominantly inside cells of body tissues and organs. Only 1% of the body's magnesium supply is found in blood, and the body works very hard to keep blood levels of magnesium constant. If your body is running low on magnesium, blood levels take top priority and are maintained at the expense of the bones and cells.
Given this, it's easy to see why blood tests could misrepresent actual magnesium levels in the body. Relying solely on blood tests to check magnesium levels — instead of signs of magnesium craving (and the realization that up to 80 percent of the population is running low) — will miss an important piece in the whole health puzzle.
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