Process of intestinal uptake and transport of magnesium into circulation.
Magnesium absorption is the process by which dietary magnesium is taken up by the intestinal epithelium and transported into circulation for enzymatic and physiological functions.
Magnesium absorption occurs throughout the small intestine via both passive and active transport mechanisms, with overall absorption efficiency ranging from 30-40% depending on dietary intake and individual factors. The active transport pathway, which becomes more important during low magnesium intake, is saturable and regulated by intestinal magnesium-binding proteins. Absorption is enhanced by adequate vitamin D status and an optimal calcium-to-magnesium ratio, while high calcium intake can competitively inhibit magnesium absorption. Stomach acid and lactose also enhance magnesium absorption, explaining why dairy products are bioavailable sources. Individual factors including digestive health, age, medications, and concurrent nutrient intake significantly affect magnesium bioavailability.
Magnesium absorption provides the mineral necessary for over 300 enzyme systems and muscle-nerve function.
Distribute magnesium-rich foods throughout the day to optimize absorption, as the body absorbs magnesium more efficiently with smaller, frequent intakes. Maintain adequate vitamin D status to support active magnesium absorption. Avoid excessive supplemental calcium without concurrent magnesium, as it may competitively inhibit magnesium absorption.
Magnesium absorption is enhanced by vitamin D and an optimal calcium balance, with distributed intake throughout the day optimizing bioavailability.
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