Magnesium
Magnesium is a mineral involved in several hundred enzyme reactions — energy, muscle and nerve function, heart rhythm and bones. Most is inside cells, so the blood level is not always a complete picture of stores.
| Rating | Range | What it means |
|---|---|---|
| Talk to a doctor | below 0.71 mmol/L | |
| Good | 0.71 – 0.94 mmol/L | Within the reference range. |
| Worth improving | 0.94 mmol/L and above |
Why it matters
EFSA: deficiency is common and often overlooked.
If it’s low
Low magnesium shows up as muscle cramps, fatigue, irritability, sometimes heart rhythm disturbances. Often with poor diet, alcohol or losses through the gut/kidneys.
If it’s high
High magnesium is rare with healthy kidneys; it occurs mainly with kidney impairment or excessive supplements/laxatives.
What to do
Low: more nuts, seeds, whole grains, leafy vegetables; a supplement if needed. With kidney impairment, be cautious with supplements.
Read together with
Calcium · Potassium
Part of the guide: Vitamins & minerals →
Articles about this marker
- Magnesium: why it matters and how to get enoughMarker explained
- Supplements for better blood: what really worksSupplements & longevity
This content is for information only and is not a substitute for medical advice. Talk to your doctor about your results.
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