What do studies say about Magnesium Labor?

The provided context does not contain specific information about magnesium lab tests or related studies. In general, serum magnesium is commonly measured but does not reliably reflect total body magnesium stores (only ~1% of magnesium is in serum). Observational studies link low serum magnesium to cardiovascular risk, diabetes, migraine, and sleep disorders, but randomized controlled trials (RCTs) show mixed results, especially for supplementation in non-deficient individuals. Evidence for routine magnesium testing in healthy people is weak. Caveat: Direct-to-consumer (DTC) blood or urine magnesium tests are not standardized and may lead to misinterpretation. A physician should always evaluate lab values in clinical context. High-dose magnesium supplements (e.g., >350 mg/day) can cause diarrhea and electrolyte disturbances. Evidence grade: unclear due to lack of study-based sources in the provided context.