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The maximum upper tolerance limit (UTL) for magnesium in supplement form for adults is 350 mg of elemental magnesium per day, according to the National Institutes of Health (NIH). [5] In addition, according to the NIH, total dietary requirements for magnesium from all sources (in other words, food and supplements) is 320–420 mg of elemental ...
Magnesium and Zinc “Magnesium and zinc compete for absorption in the intestines, meaning taking high doses of both at the same time can reduce how much your body absorbs each mineral,” says ...
That gave me a percentage of about 11.46% elemental magnesium in magnesium citrate. However, using drugs.com's information there should be 16.2% elemental magnesium in magnesium citrate. I am also confused by this article stating that the upper tolerable limit of magnesium is 350 mg.
* The daily recommended amounts of niacin and magnesium are higher than the tolerable upper limit because, for both nutrients, the ULs identify the amounts that will not increase the risk of adverse effects when the nutrients are consumed as a serving of a dietary supplement. Magnesium supplementation above the UL may cause diarrhea.
In addition to magnesium not being highly present in the foods we eat, our body only absorbs so much of it. Typically, we only absorb about 30 to 40 percent of the daily magnesium we do consume.
Tolerable upper intake levels (UL), to caution against excessive intake of nutrients (like vitamin A and selenium) that can be harmful in large amounts. This is the highest level of sustained daily nutrient consumption that is considered to be safe for, and cause no side effects in, 97.5% of healthy individuals in each life stage and sex group.
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As for safety, the IOM also sets Tolerable upper intake levels (ULs) for vitamins and minerals when evidence is sufficient. In the case of magnesium the UL is set at 350 mg/day. The UL is specific to magnesium consumed as a dietary supplement, the reason being that too much magnesium consumed at one time can cause diarrhea.