Magnesium (serum): what it means.
Cofactor in 300+ reactions. Serum captures only ~1% of body stores, so 'normal' can still mask a shortfall.
Written to our editorial standards · reviewed against published research· Updated 2 Jun 2026
Typical reference bands (mg/dL)
Lowunder 1.8 mg/dL
Optimal2-2.4 mg/dL
Highover 2.6 mg/dL
Ranges vary by laboratory, age, and sex, your lab's own reference range always takes precedence.
Common causes
- Low intake of greens, nuts, and whole grains
- High alcohol intake
- Diuretics or proton-pump inhibitors
- High stress and heavy sweating
What it can feel like
- Muscle cramps or twitches
- Poor sleep
- Anxiety or irritability
- Palpitations
- Constipation
Who should test
Because serum holds only about 1% of body magnesium, a normal result can still hide a shortfall, so symptoms and intake matter as much as the number.
Supplements that help raise Magnesium (serum)
Evidence-led, and only a piece of the picture, diet, lifestyle, and your clinician matter most.
Magnesium glycinate is well-absorbed and gentle on the gut, supporting the many reactions magnesium drives, including sleep and muscle relaxation.
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Common questions
What does a low Magnesium (serum) mean?
Common drivers include low intake of greens, nuts, and whole grains; high alcohol intake; diuretics or proton-pump inhibitors. A result outside the optimal range is best read in context: discuss it with your clinician, who can weigh the full picture and your lab's own reference range.
What supplements help raise Magnesium (serum)?
Evidence-led options include Magnesium Glycinate. They support, but don't replace, diet, lifestyle, and medical care.
Educational use only, not medical advice or diagnosis. Always interpret lab results with a qualified clinician.