What it is & primary uses
An essential mineral involved in hundreds of enzymatic reactions, neuromuscular function, and energy metabolism.
Main benefits
- Helps meet magnesium requirements
- May support sleep when status is low
Studied protocols
Research doses are grouped by outcome. They describe study designs—not a personal prescription.
200–400 mg/day elemental magnesium
- Study duration
- Daily; formulation affects tolerability
- Interpretation
- Check elemental magnesium, not compound weight. Kidney impairment changes the safety calculation.
~250–500 mg/day elemental magnesium
- Study duration
- Several weeks
- Interpretation
- Small trials in older adults suggest shorter sleep latency, but systematic reviews judge the evidence low quality and inconsistent.
04Food sources & equivalents＋
Can food provide a studied amount?
Seeds, nuts, legumes and leafy greens can provide a comparable magnesium mass as part of a normal diet.
Approximately 200–400 mg magnesium at 156 mg per 28 g
Approximately 200–400 mg magnesium at 78 mg per ½ cup
- How this was estimated
- Serving quantity scales from the NIH food table.
- Important limitation
- Dietary magnesium and a supplement bolus are not identical exposures. Absorption varies, and impaired kidney function changes supplement safety.
Food equivalents compare ingredient mass using published composition values. They do not prove equal absorption, formulation, physiological effect, safety or personal need.
Source: NIH ODS: magnesium content of selected foods ↗05How to take it for absorption & tolerance＋
With food
Magnesium salts differ in absorption and laxative effect; taking the serving with food is a practical way to reduce nausea or diarrhea.
- Practical approach
- Take with a meal and split larger daily totals if needed. Evening use is a preference, not a universal absorption requirement.
- Watch for
- Separate from interacting medicines such as some antibiotics, bisphosphonates and levothyroxine.
Meal guidance reflects human pharmacokinetic, clinical, official-label or evidence-review sources where available. A food pairing can change absorption or tolerability, but does not make a supplement necessary, effective or safe for every person.
Source: NIH ODS magnesium fact sheet ↗06Supplement interaction check＋
An unlisted pair means no established pair-specific interaction was identified in this review—not proof that every dose, product or person is safe.
NIH notes that 142 mg/day of supplemental zinc interfered with magnesium absorption in one study. That zinc amount is far above Dose Radar's 10–25 mg research range.
Routine researched amounts do not create an automatic separation rule. Review the stack if zinc intake is unusually high or used long term.
07Research notes＋
Strong for correcting inadequate intake or deficiency. Evidence for treating insomnia is limited and inconsistent.
Check the elemental magnesium amount; forms differ in tolerability and total compound weight.
08Scientific references＋
Peer-reviewed human research and formal evidence reviews. Open each source to inspect the complete paper record.
Oral magnesium for insomnia in older adults
Dose context: Three small RCTs using varied oral protocols
Possible reduction in sleep-onset latency; evidence quality was low to very low.
Magnesium and sleep health
Dose context: Observational and intervention studies
Observational associations were present, but randomized trials were contradictory.
Magnesium supplementation for sleep in adults
Dose context: Multiple magnesium forms, doses and durations
Results were inconsistent and certainty was low to very low; current evidence does not support routine magnesium treatment for insomnia.
09Expert & media references＋
Podcast and practitioner statements are clearly separated from research. They may explain practice or emerging ideas, but do not prove efficacy.