Magnesium: The Missing Mineral
Magnesium is involved in more than 300 biochemical processes in the human body — energy production, muscle function, blood pressure regulation, nerve signalling, and sleep. It is not a specialist nutrient for a specific condition. It is infrastructure. And the evidence suggests that most people in the modern world are not getting enough of it.
How deficiency became structural
The problem is largely in the soil. Intensive agricultural practices have prioritised crop yield over mineral replenishment. Magnesium, unlike nitrogen, phosphorus, and potassium, is routinely omitted from commercial fertilisation programmes. Continuous cultivation without replenishment depletes soil magnesium — particularly in acidic or sandy soils — and lower soil magnesium means lower magnesium content in the crops grown in it. Researchers have described magnesium as the "forgotten element" of modern agriculture.
This is compounded by food processing. Refining cereal grains — one of the primary dietary sources of magnesium — removes a significant proportion of their mineral content. Modern water treatment also reduces the magnesium levels historically present in drinking water. The result is that even people eating a reasonably balanced diet are regularly consuming far less magnesium than previous generations did from equivalent foods.
A comprehensive review published in the International Journal of Vitamins and Nutrition Research estimated that 2.4 billion people — roughly 31% of the global population — fail to meet recommended magnesium intake levels. In developed countries, studies place the figure at between 30% and 50% of adults.
(International Journal of Vitamins and Nutrition Research — Global Dietary Magnesium Deficiency: Prevalence, Underlying Causes, Health Consequences, and Strategic Solutions)
What deficiency actually does
Magnesium deficiency is rarely obvious. It is subclinical in most cases — meaning standard blood tests may appear borderline while intracellular magnesium, which is harder to measure, has been depleted over time. The consequences accumulate gradually and are often attributed to other causes.
The cardiovascular evidence is among the most documented. Research published in Open Heart by the British Cardiovascular Society identified subclinical magnesium deficiency as a principal driver of cardiovascular disease, linking low magnesium levels to elevated blood pressure, arterial stiffness, cardiac arrhythmia, and increased systemic inflammation. The authors described it as an underrecognised public health crisis.
Beyond cardiovascular health, low magnesium is consistently associated with disrupted sleep, increased muscle tension and cramping, reduced insulin sensitivity, and impaired cellular energy production. Clinical trials have shown that magnesium supplementation significantly improved sleep duration and reduced the time it takes to fall asleep — findings consistent with magnesium's role in regulating the nervous system and melatonin synthesis.
(Open Heart / British Cardiovascular Society — Subclinical magnesium deficiency: a principal driver of cardiovascular disease and a public health crisis)
Why form determines outcome
Not all magnesium supplements deliver the same result, and the difference comes down to the form used.
Most products on the market use magnesium oxide — the cheapest option, and one that looks impressive on a label because it contains a high amount of elemental magnesium. The problem is that magnesium oxide is poorly absorbed. A systematic review comparing magnesium supplements across 14 studies concluded consistently that inorganic formulations, including oxide, are less bioavailable than organic alternatives. Much of what is listed on the label simply passes through the body without being absorbed.
(ScienceDirect — Bioavailability of magnesium food supplements: A systematic review)
Magnesium citrate is better absorbed than oxide and is a common step up in quality. However, citrate works by drawing water into the intestines — which is why it is also used medically as a laxative. At supplemental doses, this mechanism frequently causes loose stools and digestive discomfort, making it poorly tolerated for daily long-term use.
Magnesium bisglycinate is magnesium bound to the amino acid glycine. It is absorbed through a different pathway that does not rely on the same intestinal mechanism, which means it is significantly gentler on digestion and better tolerated. The glycine component also has independent evidence for supporting sleep quality, complementing magnesium's own role in nervous system regulation.
Magnesium malate binds magnesium to malic acid, a compound the body uses directly in cellular energy production. It shares the superior absorption of organic forms and is particularly relevant for muscle function and fatigue.
Together, bisglycinate and malate address the main areas where magnesium's evidence is strongest — sleep, cardiovascular health, muscle function, and energy — while avoiding the digestive trade-offs of cheaper forms. For a mineral this central to basic physiological function, the form is not a label detail. It determines whether the supplement actually works.
Dr. Jose Rokiski
5th June 2026