Magnesium is involved in over 300 enzymatic reactions in your body, yet deficiency may be remarkably common and can be missed by standard testing.
Why Magnesium Matters
Magnesium is essential for:
- Energy production
- Muscle and nerve function
- Blood sugar regulation
- Blood pressure control
- Sleep quality
- Stress response
- Bone health
Symptoms Deficiency May Cause
- Muscle cramps and twitches
- Fatigue
- Anxiety and irritability
- Insomnia
- Headaches
- Heart palpitations
- PMS symptoms
Why It Can Be Underdiagnosed
Standard serum magnesium tests only measure blood levels, which represent just 1% of your body's magnesium. Your body tightly regulates blood magnesium, and it can pull from bones and tissues when needed.
Better Testing Options
Serum Magnesium
Standard test, but it can be insensitive. It may only show severe deficiency.
RBC Magnesium
Measures magnesium inside red blood cells. May be a more accurate reflection of body stores. Optimal may be 5.0-6.5 mg/dL.
Consider Your Symptoms
If you have symptoms of deficiency and risk factors, supplementation may be warranted even with "normal" levels.
Risk Factors
- Stress (can deplete magnesium)
- High sugar intake
- Digestive disorders
- Diabetes
- Alcohol use
- Certain medications (PPIs, diuretics)
References
- Rosanoff, A., et al. (2012). Suboptimal magnesium status in the United States: are the health consequences underestimated? Nutrition Reviews, 70(3), 153-164. PMID 22364157
- DiNicolantonio, J. J., et al. (2018). Subclinical magnesium deficiency: a principal driver of cardiovascular disease and a public health crisis. Open Heart, 5(1), e000668. PMID 29387426
