Wed, Jan-28-09, 11:06
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Experimenter
Posts: 25,865
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Plan: DDF
Stats: 202/185.4/179
BF:
Progress: 72%
Location: San Diego, CA
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I don't see a chart regarding bioavailability of magnesium in the NIH document. There's a chart showing the amount of magnesium (versus the inert ingredients) and a pargraph of text saying that there's a big difference between the types as far as bioavailability. Figure 1 compares the amount of elemental magnesium in different types
Quote:
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Oral magnesium supplements combine magnesium with another substance such as a salt. Examples of magnesium supplements include magnesium oxide, magnesium sulfate, and magnesium carbonate. Elemental magnesium refers to the amount of magnesium in each compoupes of magnesium supplements [28]. The amount of elemental magnesium in a compound and its bioavailability influence the effectiveness of the magnesium supplement. Bioavailability refers to the amount of magnesium in food, medications, and supplements that is absorbed in the intestines and ultimately available for biological activity in your cells and tissues. Enteric coating of a magnesium compound can decrease bioavailability [29]. In a study that compared four forms of magnesium preparations, results suggested lower bioavailability of magnesium oxide, with significantly higher and equal absorption and bioavailability of magnesium chloride and magnesium lactate [30]. This supports the belief that both the magnesium content of a dietary supplement and its bioavailability contribute to its ability to replete deficient levels of magnesium.
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I think if you want the laxative effect you probably need one that is poorly absorbed, if I understand correctly how it works. |