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Magnesium RBC Testing provides a deeper, more accurate view of your body’s magnesium status at the cellular level. Unlike standard serum magnesium tests, which can miss deficiencies, Magnesium RBC testing measures the amount stored inside red blood cells — where magnesium does most of its critical work. Magnesium is essential for over 300 enzymatic reactions, including muscle function, nerve signaling, energy production, and heart rhythm regulation. Low levels are linked to fatigue, anxiety, muscle cramps, and cardiovascular issues. This test is ideal for individuals experiencing chronic stress, sleep problems, or those optimizing performance and recovery. It’s a cornerstone of advanced nutritional health.