Posted by Larry Hoover on May 21, 2003, at 15:27:36
In reply to Re: Mitral Valve Prolapse and ADs » Larry Hoover, posted by mattdds on May 17, 2003, at 14:38:50
> What is the best type of magnesium supplement? I remember reading somewhere that the oxides of Mg are essentially worthless as supplements, as they are not absorbed well. Or are they all the same?
>
> Thanks,
>
> MattHere is a reference for the low bioavailability of mag oxide (4% of total magnesium). BTW, the MSDS for mag oxide puts solubility in water at 0.1%. Mag chloride is about 160 grams per 100 grams water.
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.
poster:Larry Hoover
thread:227225
URL: http://www.dr-bob.org/babble/20030520/msgs/228115.html