MyBody-X angle on Magnesium Test

The MyBody-X Magnesium Test (likely a blood or genetic test) measures serum magnesium, which is tightly regulated and may not reflect total body stores. A more accurate assessment would include RBC magnesium or 24-hour urine. Genetic variants (e.g., TRPM6) can influence absorption, but evidence for personalized supplementation is weak. The test should not be used alone to justify high-dose magnesium, as excess can cause diarrhea or, in renal impairment, toxicity. Official guidelines (DGE, WHO) set intake recommendations based on population needs, not genetics. Evidence: practice/mixed – useful as a screening tool but not diagnostic for deficiency. Combine with clinical symptoms and medical advice.