Can you overdose on magnesium from supplements?

Not from oral magnesium in healthy people — excess is excreted via urine. Very high doses cause diarrhea. Kidney disease requires medical supervision.

Which magnesium is best for sleep?

Magnesium glycinate is consistently recommended for sleep — it's well-absorbed and doesn't cause GI upset.

Does magnesium interact with medications?

Magnesium reduces absorption of antibiotics (quinolones, tetracyclines) and bisphosphonates — take 2 hours apart. It can lower blood pressure, so caution with antihypertensives.

How do I know if I'm magnesium deficient?

Standard serum magnesium tests only reflect 1% of body stores. Red blood cell (RBC) magnesium is more sensitive. But given deficiency is common, a 1-month trial of magnesium glycinate is reasonable for anyone with symptoms.

What does magnesium deficiency look like vs calcium deficiency?

Both cause muscle cramps and irregular heartbeat. Magnesium deficiency more commonly presents as anxiety, insomnia, and fatigue. Calcium deficiency more often causes numbness, dental problems, and osteoporosis.

Magnesium Deficiency: Signs, Causes, and How to Fix It

Why Magnesium Deficiency Is Epidemic

Modern soil depletion has reduced magnesium content in food by 20–30% since 1950. Refined food processing removes 80–96% of magnesium. Average US intake: 228 mg/day (men) and 193 mg/day (women) — well below the RDA of 400–420 mg (men) and 310–320 mg (women).

Subtle Signs of Low Magnesium

Muscle cramps and twitches (especially eyelid twitching). Poor sleep quality or insomnia. Chronic fatigue without obvious cause. Anxiety, nervousness, low stress tolerance. Restless legs syndrome. Constipation. Irregular heartbeat (palpitations).

Best Food Sources of Magnesium

Pumpkin seeds: 150 mg/28g (37% DV). Chia seeds: 95 mg/28g. Dark chocolate: 64 mg/28g. Hemp seeds: 210 mg/30g. Almonds: 76 mg/28g. Spinach: 79 mg/100g cooked. Black beans: 70 mg/100g. Brown rice: 43 mg/100g. Avocado: 29 mg/100g.

Magnesium Forms for Supplementing

Magnesium glycinate: chelated, high bioavailability, best for sleep and anxiety, gentle on digestion. Magnesium malate: good for energy, muscle function. Magnesium citrate: decent absorption, mild laxative effect — useful for constipation. Magnesium oxide: cheap, only 4% absorbed — avoid. Start with 100–200 mg and increase to 300–400 mg. Take at night (promotes sleep).

Magnesium and Sleep

Magnesium activates the parasympathetic nervous system (rest-and-digest). Regulates melatonin production. Binds to GABA receptors — same receptors targeted by benzodiazepines. Clinical trials show magnesium glycinate improves sleep onset, duration, and efficiency in deficient adults.

Who Needs to Supplement

Alcohol-dependent individuals (alcohol depletes magnesium). Type 2 diabetics (low magnesium is common and worsens insulin resistance). People taking diuretics or proton pump inhibitors. Athletes with high sweat output. Older adults (reduced absorption with age).