> Research summary — not medical advice. This page synthesizes published research on a mechanism-level intervention. It is not a clinical recommendation. Consult a qualified healthcare provider before making any changes to diet, supplementation, or treatment.
Intervention Summary
Magnesium supplementation to address the documented magnesium deficiency in fibromyalgia and its role in central sensitization. Magnesium is a physiological NMDA receptor antagonist — blocking the receptor channel that drives wind-up and central pain amplification in FM. Additionally serves as a cofactor for >300 enzymatic reactions including ATP synthesis.
Evidence
- RCTs: Magnesium citrate (300mg/day, 8 weeks) reduced tender point count and FIQ scores compared to placebo in FM patients
- Cross-sectional: Low serum Mg correlates with higher pain scores, worse sleep quality, and elevated substance P in FM
- Intracellular Mg: Red blood cell magnesium (a more accurate measure than serum) is consistently low in FM cohorts
- Combination: Magnesium + malic acid combination showed pain reduction in early clinical trials, though replication is needed
Mechanism
- NMDA receptor blockade: Mg2+ sits in the NMDA receptor channel at resting potential, preventing calcium influx. Mg deficiency removes this block, facilitating glutamate excitotoxicity and central sensitization
- ATP cofactor: Mg-ATP is the biologically active form of ATP; Mg deficiency impairs cellular energy production, contributing to the fatigue hallmark of FM
- Calcium channel modulation: Mg competes with Ca2+ at voltage-gated channels, reducing neuronal hyperexcitability
- Sleep architecture: Mg deficiency disrupts sleep quality; supplementation improves sleep onset and slow-wave sleep duration
Clinical Context
Magnesium glycinate or citrate are preferred forms for bioavailability (magnesium oxide is poorly absorbed). Typical dose: 300-600mg elemental Mg/day, divided doses. GI tolerance improves with gradual dose escalation. Serum Mg is an insensitive marker — RBC magnesium or ionized Mg better reflects tissue status. Most FM patients benefit from sustained supplementation rather than short courses.
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> Educational content, not medical advice. This page describes mechanisms by which the intervention interacts with the microbiome and metal ecology. It is not a treatment recommendation. Clinical decisions about any intervention should be made with a qualified healthcare practitioner who knows your individual history.