One gets about 8mg of magnesium from 400mg of magnesium oxide. This was done in studies.
Quote:
Magnes Res. 2001 Dec;14(4):257-62.
Bioavailability of US commercial magnesium preparations.
Firoz M, Graber M.
Department of Veterans Affairs Medical Center, Northport, NY 11768, USA.
Magnesium deficiency is seen with some frequency in the outpatient setting and requires oral repletion or maintenance therapy. The purpose of this study was to measure the bioavailability of four commercially-available preparations of magnesium, and to test the claim that organic salts are more easily absorbed. Bioavailability was measured as the increment of urinary maginesium excretion in normal volunteers given approximately 21 mEq/day of the test preparations. Results indicated relatively poor bioavailability of magnesium oxide (fractional absorption 4 per cent) but significantly higher and equivalent bioavailability of magnesium chloride, magnesium lactate and magnesium aspartate. We conclude that there is relatively poor bioavailability of magnesium oxide, but greater and equivalent bioavailability of magnesium chloride, lactate, and aspartate. Inorganic magnesium salts, depending on the preparation, may have bioavailability equivalent to organic magnesium salts.
PMID: 11794633 [PubMed - indexed for MEDLINE]
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from... http://www.ncbi.nlm.nih.gov/pubmed/11794633?ordinalpos=1&itool=EntrezSystem2.PEntrez. Pubmed.Pubmed_ResultsPanel.Pubmed_SingleItemSupl.P ubmed_Discovery_RA&linkpos=2&log$=relatedarticles& logdbfrom=pubmed
400mg of mag oxide has 200mg of elemental magnesium, so 4% of 200mg is 8mg.
So yes, for a laxative mag oxide will work. There is a product of magnesium designed as a laxative...Phillips Milk of Magnesia. It contains magnesium oxide.
http://phillipsrelief.com/caplets.html
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