Sugilithia describes the contribution magnesium makes to the body’s electrolyte balance under EU Regulation No. 432/2012 — placed in scientific context, with the claim’s full wording included.
Open the Fact SheetEvery cell in the body is surrounded by a thin membrane that separates two fluid compartments with different compositions: the inside of the cell and the space outside it. Charged particles are dissolved in both compartments, and the ratio between them is anything but random.
This ratio doesn’t establish itself, and it doesn’t hold steady on its own either. It is continuously maintained by transport mechanisms at the cell membrane that consume energy and depend on certain minerals in order to work at all.
In its scientific opinions, the European Food Safety Authority (EFSA) set out the documented contribution individual minerals make to this balance. On this basis, an EU-authorized claim exists for magnesium, and its exact wording is quoted below.
As a macromineral, magnesium cannot be produced by the body; it enters only through food, and needs to do so at regular intervals. Part of it is bound to ATP — the molecule that supplies energy for numerous processes at the cell membrane.
This is exactly where the following EU-reviewed claim comes in:
EU-authorized wording · Regulation (EU) No 432/2012
The scientific background of the claim can be traced to two specific locations in the body: the membrane of nearly every cell, and the inside of the kidney. Both sections explain why magnesium was reviewed by EFSA in this context — they are not themselves part of the authorized wording.
The membrane of almost every cell holds an enzyme that continuously moves three sodium ions out and two potassium ions in — against their respective concentration gradients. This process requires energy, which comes from the splitting of ATP.
The actual substrate this enzyme recognizes and splits is not free ATP but the magnesium-ATP complex. Without bound magnesium, the enzyme loses most of its ability to drive this ion movement at all.
In the thick ascending limb of the loop of Henle — a section of the kidney — channels known as ROMK recycle potassium ions back into the interior of the renal tubules. This creates a locally positive electrical charge compared with the surrounding tissue.
This local voltage gradient drives most of the reabsorption of magnesium from the primary urine back into the blood. If the potassium channel loses function, the amount of magnesium reabsorbed this way also decreases.
Because the sodium-potassium pump works continuously, sodium stays far more concentrated outside the cell than inside it, while potassium behaves the opposite way. This gradient doesn’t settle into place once and for all; it has to be defended continuously against the natural tendency toward equalization — an ongoing process in which magnesium is directly involved through its binding to ATP.
The digital fact sheet brings together the mechanisms introduced here and the table, along with the full wording of the EU claim on magnesium, in a single document.
One-time access · Digital information product
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