Magnesium, RBC

What This Marker Means

RBC magnesium reflects the magnesium stored inside cells—an accurate measure of long-term magnesium status. Low levels are associated with poor sleep, muscle tension, headaches, and insulin resistance.

How Alcohol Affects This Marker

Alcohol increases urinary magnesium loss and impairs absorption. Low magnesium is extremely common in regular drinkers and contributes to restless sleep, anxiety, and irregular heart rhythms.

How to Discuss With Your Doctor

If low, ask whether supplementation or dietary changes might help. Discuss symptoms like poor sleep or anxiety, which may relate to low magnesium from alcohol use.