Miracle mineral? Magnesium is the hottest-selling supplement. Does it work? Can it be dangerous?

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In the fast-moving world of supplements, it’s magnesium’s time to shine.

And the industry is booming. The global magnesium market is worth almost £3bn and that’s set to nearly double over the next decade.

I can almost hear the eye roll when I contact Kirsten Jackson, an IBS Dietitian, who specialises in gut health.

“Clever marketing schemes,” Ms Jackson says, “magnesium is involved in areas people are willing to invest in: their sleep, digestion, mental health.”

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So, surely popping a pill full of the stuff should keep our bodies running smoothly?

It’s more complex than that, says Ms Jackson. For a magnesium supplement to work, we need to be lacking the mineral in the first place – and it’s difficult to test for any deficiency because the vast majority of our magnesium is stored in our bones and tissues.

For those with kidney disease, taking magnesium supplements can be dangerous and can cause hypermagnesemia – a potentially life-threatening condition that can leave someone with paralysis or in a coma.

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