Magnesium is involved in over 300 enzymatic reactions in your body, yet studies suggest that up to 60% of adults don't meet the recommended daily intake. This widespread shortfall has real health consequences that many people attribute to other causes.
Signs You Might Be Low
- Muscle cramps and spasms, especially at night
- Difficulty sleeping or restless sleep
- Anxiety, irritability, or low mood
- Fatigue despite adequate rest
- Headaches and migraines
- Heart palpitations
- Constipation
Why Deficiency Is So Common
Modern diets are lower in magnesium than historical diets due to soil depletion, food processing that removes magnesium-rich bran and germ from grains, and lower consumption of leafy greens. Additionally, stress increases magnesium excretion, alcohol depletes magnesium, and certain medications (PPIs, diuretics, some antibiotics) reduce magnesium absorption or increase loss.
Forms of Magnesium Supplements
Not all magnesium supplements are created equal. The form affects both absorption and specific benefits:
Magnesium citrate: Well-absorbed and good for general supplementation. Also has a mild laxative effect, helpful for those with constipation.
Magnesium glycinate: Bound to glycine, an amino acid that itself has calming properties. Excellent for sleep and anxiety support. Gentlest on the stomach.
Magnesium taurate: Particularly studied for cardiovascular benefits.
Magnesium threonate: May cross the blood-brain barrier more effectively, potentially beneficial for cognitive function.
Magnesium oxide: Contains more elemental magnesium per tablet but absorbs poorly. Mainly useful as a laxative.
Getting More Through Food
Food sources rich in magnesium include dark leafy greens (spinach, Swiss chard), nuts and seeds (pumpkin seeds, almonds), dark chocolate (70%+ cocoa), avocados, bananas, legumes, and whole grains. However, reaching optimal intake through food alone is challenging for many people.
Optimal Dosing
The RDA is 310-420mg daily depending on age and sex, but many functional medicine practitioners suggest higher intakes. Start with 200mg and increase gradually to bowel tolerance (loose stools indicate you've reached your limit). Evening dosing can support sleep quality.
Safety Notes
Magnesium is generally very safe. People with kidney disease should consult their doctor before supplementing, as impaired kidneys cannot excrete excess magnesium effectively. Magnesium can interact with certain antibiotics and bisphosphonates — separate dosing by at least 2 hours.