Magnesium is one of the body’s quiet workhorses. Alongside key vitamins and minerals, magnesium underpins how we produce energy, use it and keep it in balance. From mitochondrial adenosine triphosphate (ATP) production to muscle contraction and blood sugar regulation, magnesium sits at the centre of metabolic function.

Powering Cellular Energy

At the most fundamental level, magnesium is essential for energy production itself. Inside cells, ATP – the body’s energy currency – exists almost exclusively bound to magnesium as Mg-ATP. This complex allows energy to be transferred and used efficiently across all tissues. In fact, most intracellular magnesium is associated with ATP or adenosine diphosphate (ADP),^1,2 highlighting just how tightly magnesium availability and cellular energy are linked. Without magnesium, the enzymes that drive glycolysis, fatty acid oxidation and the citric acid cycle (CAC) simply cannot function.²

Energy in Motion: Muscles, Heart and Nerves

In a well-functioning system, energy must also be used efficiently. Magnesium helps regulate muscle contraction and relaxation by balancing calcium activity.^2,3 This extends beyond skeletal muscle to vascular smooth muscle and the heart, where magnesium supports normal rhythm, conduction and contractility.⁴ It also plays a critical role in creatine kinase activity – the ATP ‘recycling’ system that sustains muscle and cardiac performance during periods of high demand.^1,5

In the nervous system, magnesium has a calming influence, modulating excitatory glutamate signalling while supporting inhibitory gamma-aminobutyric acid (GABA) activity.⁶ When magnesium is low, this balance is lost, often presenting clinically as muscle cramps, heightened neuromuscular excitability, anxiety, and fatigue.^7,8 Moreover, a bidirectional relationship exists between stress and magnesium levels: physiological stress increases magnesium loss, while magnesium deficiency renders the body more susceptible to the effects of stress.⁹

Keeping Energy in Balance: Glucose and Insulin

Beyond producing and using energy, magnesium helps regulate where energy goes. Magnesium-dependent ATP signalling is involved in insulin release from pancreatic beta-cells^10-12 and is required for insulin receptor activation in liver, muscle and adipose tissue.¹⁰ Put simply, magnesium supports both insulin secretion and insulin sensitivity. When magnesium levels are insufficient, glucose handling becomes less efficient, contributing to insulin resistance and metabolic strain.

Evidence-Based Clinical Indications for Magnesium Supplementation

In conditions such as cardiometabolic disorders or those presenting with a component of chronic stress (or physical or mental fatigue), supplementation may be necessary to meet the body’s increased magnesium requirements. Restoring magnesium status can have a wide range of effects, many of which tend to overlap across multiple clinical presentations (e.g. diabetes, nocturnal leg cramps and sleep disturbances).^13,14

Therapeutic doses of magnesium vary widely depending on the condition,¹⁵ but generally fall within the 200 to 600 mg/day range,¹⁶ with higher doses used under medical supervision.

Based on clinical evidence, oral magnesium is indicated for:

• Coronary artery disease^17,18
• Blood pressure management,^19-22 particularly among those with hypertension and hypomagnesemia^23-25
• Improving endothelial function²⁶ and reducing arterial stiffness²⁷
• Improving glucose control,^28-32 blood pressure^29,31 and lipid profile³¹ in type 2 diabetes mellitus (T2DM); in prediabetes;^33-35 and metabolic syndrome (MetS)³⁶
• Gestational diabetes mellitus (GMD)^37,38 and preventing pre-eclampsia³⁹
• Reducing body mass index (BMI) in obesity⁴⁰
• Reducing inflammation across various cardiometabolic disorders^41-43
• Poor sleep⁴⁴
• Reducing the frequency and intensity of migraines⁴⁵
• Restless legs syndrome (RLS)⁴⁶ and nocturnal leg cramps⁴⁷
• Physiological and psychological premenstrual symptoms^48,49 (greatest effects with vitamin B6 co-supplementation)^50,51 and primary dysmenorrhoea⁵²
• Adjuvant treatment of fibromyalgia with amitriptyline⁵³
• Stressed adults with hypomagnesemia (with or without vitamin B6 co-supplementation)^54,55
• Supporting physical performance and training,^56-58 and relieving muscle soreness from physical activity⁵⁹

Recommended Magnesium Supplement for Advanced Absorption

Practitioners are encouraged to critically consider the bioavailability and tolerability of the type of magnesium they choose to prescribe. *For more information refer to the Integria Practitioner Magnesium Chart.

Among the types of magnesium available, magnesium glycinate (MetaMag®) is a standout, composed of a magnesium molecule bound to two glycine molecules. Magnesium bisglycinate demonstrates superior bioavailability to other forms of supplemental magnesium, such as magnesium oxide.⁶⁰ Magnesium glycinate is well tolerated; binding magnesium to glycine minimises laxation and improves gastrointestinal tolerability,^61,62 making it non-irritating to the stomach and gentler on the bowel than other types of magnesium.

References

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