Common mistakes around Magnesium Check

A magnesium check (e.g., in blood or urine) is often marketed as a measure of total body magnesium status. However, serum magnesium reflects only about 1 % of total body magnesium and only drops in severe deficiency. More accurate methods (e.g., intracellular magnesium in red blood cells or magnesium retention test) are rarely offered in consumer tests. Common mistakes include assuming a normal serum level rules out deficiency, or supplementing without testing, which can cause diarrhea or drug interactions. Evidence for routine magnesium testing in healthy individuals is weak. Many consumer tests lack clinical validation and are primarily marketing tools. If you suspect a deficiency (e.g., cramps, fatigue), consult a doctor rather than relying on a direct-to-consumer test.