Why Magnesium Matters So Much for Women Over 40
Magnesium is involved in over 300 enzymatic reactions in the body. Most women over 40 are deficient, and the symptoms of deficiency overlap almost perfectly with common perimenopausal complaints: poor sleep, anxiety, muscle cramps, fatigue, and headaches. Correcting magnesium deficiency often produces dramatic improvements.
The Benefits
Better sleep (supports GABA and melatonin), reduced anxiety (calms the nervous system), fewer muscle cramps, improved bone density (60% of body magnesium is in bone), better blood sugar control, reduced migraine frequency, and reduced PMS symptoms.
The Best Types of Magnesium
Magnesium Glycinate — Best for Sleep and Anxiety
Highly bioavailable, gentle on the stomach, and the glycine component adds a calming effect. The best all-around choice for women over 40.
Magnesium L-Threonate — Best for Brain
The only form that crosses the blood-brain barrier efficiently. Best for memory, focus, and cognitive function.
Magnesium Citrate — Best for Constipation
Has a mild laxative effect. Useful if you also struggle with constipation, but can cause loose stools at higher doses.
Avoid Magnesium Oxide
The cheapest and most common form in low-quality supplements — but poorly absorbed (only 4% bioavailability). Avoid it.
Dosage
The recommended daily intake for women is 310-320mg, but therapeutic doses for sleep and anxiety are typically 300-400mg of elemental magnesium, taken in the evening. Start low and increase gradually.
The Bottom Line
For most women over 40, magnesium glycinate 300-400mg in the evening is the ideal choice — supporting sleep, anxiety, muscle function, and bone health simultaneously. It is one of the safest and most beneficial supplements available.
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