Magnesium

Apr 20
4 min read

Magnesium is a major cofactor in over 300 enzymatic reactions in the body, less a supplement than a piece of physiologic infrastructure. It is required for energy production (ATP), insulin signaling, protein synthesis, blood pressure regulation, and proper muscle and nerve function, essentially touching every major system we care about.

And it goes deeper: magnesium is necessary for the creation and protection of DNA and RNA and for the production of glutathione, one of our most important intracellular antioxidants/detox mechanisms. About half of our magnesium is stored in bone and most of the rest in soft tissues, with less than 1% circulating in the blood, tightly regulated by the kidneys, so the serum level we commonly measure is a very limited window into total body status.

Meanwhile, modern intake has quietly eroded; large portions of the population do not meet daily requirements, driven by mineral-depleted soils, a shift toward processed foods, and substantial magnesium loss during food refinement. This is especially true for children. The result is a high prevalence of subclinical deficiency that is easy to miss and likely under appreciated clinically, something we have seen translate into meaningful benefit when corrected in children in our own practice.

"However, recent reports estimate that at least 60% of Americans do not consume the recommended daily amount of Mg2+. Part of the problem stems from the soil used for agriculture, which is becoming increasingly deficient in essential minerals. Over the last 60 years the Mg2+ content in fruit and vegetables decreased by 20–30%. Moreover, the Western diet contains more refined grains and processed food. Estimates are that 80–90% of Mg2+ is lost during food processing. As a result, a significant number of people are Mg2+ deficient, which may comprise up to 60% of critically ill patients. Mg2+ deficiency is commonly determined by measuring total serum Mg2+concentrations, which ranges between 0.7 and 1.05 mM in a healthy person. However, serum Mg2+ values reflect only 1% of the body Mg2+ content, since most of the body's Mg2+ is stored in bone, muscle, and soft tissues. Therefore, although serum values are within the normal range, the body can be in a severely Mg2+-depleted state. Consequently, the clinical impact of Mg2+ deficiency may be largely underestimated." (Debaaij et. al. 2015)

Dietary sources remain the best entry point: leafy greens like spinach, nuts, seeds, legumes, whole grains, avocado, and to a lesser extent fish, poultry, and meat; Epsom salt exposure via baths and supplementation can help fill gaps. Deficiency tends to cluster in predictable places, gastrointestinal disease (malabsorption), type 2 diabetes (renal wasting), alcohol use, and poor diet and is compounded by medications like proton pump inhibitors, certain antibiotics, and diuretics.

When magnesium runs low, systems start to fray: blood pressure becomes harder to regulate, arrhythmia risk rises, bone health declines over time, migraines become more likely, and insulin resistance worsens, particularly in diabetes, where urinary magnesium loss creates a self-reinforcing loop. In more acute settings, magnesium reminds us of its importance, we use it intravenously to stabilize life-threatening arrhythmias and severe asthma. On the neurologic side, insufficiency is associated with increased anxiety, poor sleep, constipation, attention challenges, IBS, and fatigue, while at the cellular level, low magnesium in the setting of oxidative stress increases vulnerability to DNA and RNA damage, accelerating aging biology.

Absorption and utilization are optimized in the presence of vitamin D, B6, selenium, and amino acids like taurine, nutrients that tend to travel together in whole foods and with adequate sun exposure. The practical takeaway is simple: if a patient looks or feels “tight”, mentally or physically, magnesium deserves attention. Start with food, prioritize real sources, get regular sunlight, and if needed, supplement with well-tolerated forms like glycinate or taurate; citrate has its place, particularly if constipation is part of the story, but it can be a bit too effective for some.

Frankly, the clinical benefit of magnesium in children has been profound in our clinic.

Take home point: if you feel mentally or physically tight, you are likely low in magnesium. Load up the nuts, organic spinach, salmon, organic soy and beans. Get out in the sun for 20 minutes daily without sunscreen. If that does not work, take magnesium supplements like magnesium taurate or glycinate. Watch out for citrate - it can give you a nasty bout of #3 or offer benefits where one is constipated.

What the last 5 years of research show us:

1. Blood pressure and CV diseases - Signal: modest, consistent benefit

· A 2025 meta-analysis showed: ↓ SBP −2.8 mmHg, ↓ DBP −2.0 mmHg

· Dose range 80–600 mg/day, median 365 mg over 12 weeks (Argeros et. al. 2025)

Clinical interpretation: Magnesium behaves like a vascular tone stabilizer, not dramatic, but population-level meaningful, especially layered onto metabolic dysfunction

2. Inflammation & immunometabolism

· 2025 meta-analysis (RCTs, metabolic syndrome):↓ CRP (SMD −0.327; statistically significant)

· Broader systematic reviews: Small but significant CRP reductions (Cepeda et. al. 2025), Mixed/no consistent effects on IL-6, TNF-α, oxidative markers (Wang et. al. 2025)

Clinical interpretation: Magnesium is not a primary anti-inflammatory drug, but it likely modulates baseline inflammatory tone, especially in insulin-resistant states.

3. Neuropsychiatric outcomes (sleep, mood, cognition)

Sleep

· Some RCTs: ↑ sleep efficiency, duration, HRV readiness,↓ insomnia severity (Breus et. al. 2024) (Schuster et. al. 2025)

· But systematic reviews: Small trials, inconsistent findings

Depression

· Meta-analysis:

· Reduction in depressive symptoms (small RCT pool) (Saric et. al. 2025)

Migraines

· Magnesium modulates neuronal excitability through voltage-gated calcium antagonism and N-methyl-D-aspartate receptor blockade, thereby attenuating cortical spreading depression and trigeminovascular activation, both core migraine mechanisms (Saric et. al. 2025)

Clinical interpretation: Magnesium appears most helpful when there is deficiency + stress physiology dysregulation.