Magnesium (serum): what it means.
Written to our editorial standards · reviewed against published research· Updated 27 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.
Shop the top pick for magnesium (serum)
Recommended
Doctor's Best, High Absorption Magnesium Glycinate
240 tablets · ~$18 · ★ 4.7
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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.