Magnesium Glycinate Dosage Guide

## Overdose Profile Acute magnesium glycinate toxicity is extremely unlikely in individuals with normal kidney function. The kidneys efficiently excrete excess magnesium, providing a robust safety buffer against accidental overconsumption. Fatal hypermagnesemia from oral magnesium supplementation in healthy individuals is essentially unreported in the medical literature. ## Risk Factors for Toxicity The only population at significant risk of magnesium toxicity from oral supplementation is individuals with **substantially impaired renal function** (chronic kidney disease stage 4-5, GFR < 30 mL/min). In these patients, the kidneys cannot adequately excrete excess magnesium, allowing serum levels to rise to dangerous concentrations. Elderly patients with age-related renal decline who take high-dose magnesium supplements represent the highest-risk group. ## Symptoms of Hypermagnesemia If excessive magnesium does accumulate (almost exclusively in renal failure): - **Mild** (1.7-2.3 mmol/L): nausea, vomiting, facial flushing, urinary retention - **Moderate** (2.3-5.0 mmol/L): hypotension, drowsiness, diminished reflexes, muscle weakness, ECG changes - **Severe** (>5.0 mmol/L): respiratory paralysis, complete heart block, cardiac arrest ## Treatment In the rare event of symptomatic hypermagnesemia, **intravenous calcium gluconate** is the first-line antidote (10-20 mL of 10% solution), which directly antagonizes the effects of magnesium at the neuromuscular junction and cardiac conduction system. Hemodialysis can rapidly remove excess magnesium in severe cases. ## Practical Reality For the vast majority of supplement users, the "overdose" scenario with magnesium glycinate is mild GI discomfort or loose stools — symptoms that serve as a natural dose-limiting mechanism. Taking even 2-3 times the recommended dose in a healthy individual is unlikely to produce anything beyond temporary digestive upset.