How are Magnesium and sleep related?

Magnesium is frequently linked to sleep quality because it supports GABA function and melatonin synthesis. Some studies suggest magnesium supplementation can reduce sleep onset latency and improve sleep efficiency, especially in individuals with low magnesium status. However, the evidence is moderate: many trials are small or observational. A blood test (serum or RBC magnesium) is more actionable than genetic testing, as absorption and utilization depend on diet, gut health, and medications. Consumer DNA tests like MyBody-X may report variants in magnesium transporters (e.g., TRPM6), but these do not justify personalized dosing. Official guidelines (e.g., EFSA, DGE) provide general intake recommendations (300–400 mg/day for adults) but not genotype-specific advice. Supplementation beyond the upper limit (250 mg from supplements) may cause diarrhea. For chronic sleep issues, clinical evaluation is recommended before relying on supplements.