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Magnesium

Magnesium

Best for

Build key mineral stores

Proven strong benefit · 15–1500 mg/day for 1–52 weeks · 1 meta-analysis , n=2.3k

70 papers · 22 claims · 155 outcomes scored · 15 positive

Evidence summary

Evidence summary

Proven strong benefit

Magnesium strongly improves magnesium status in people with low intake or deficiency, with the clearest benefit being replenishing key mineral stores rather than changing sleep or cramps dramatically.

  • Across 28 studies (n=2,348), magnesium increased key mineral stores across 43 endpoints.1
  • Research spans 70 papers and 155 outcomes, but strongest evidence concentrates on mineral repletion.1
  • Sleep and cramp benefits remain secondary and less consistent than mineral repletion.

Outcomes

What magnesium actually does, by outcome

Each row is one outcome with effect size, evidence base, the dose that worked in trials, and time to first effect. Magnitude tiers come from native-unit MCID where available, Cohen's d otherwise.

Build key mineral stores Proven strong benefit

Essential mineral blood levels rise into optimal range, confirming absorption.

28 meta-analyses n=2.3k 15–1500 mg 1–52 wk #1/5
17018656·20579398·23853635·25247020 +24 more
Wake up clear-headed Large effect, needs confirmation

Less grogginess, more energy from the moment you open your eyes.

3 RCTs n=329 250–2000 mg 3–6 wk #2/14
39252819·41601871·40918053
Ease constipation and stay regular Promising early signal

Softer stools, less straining, and more complete bowel movements.

5 meta-analyses n=202 1.5–2000 mg 4–12 wk #8/18
31587548·36703238·37243443·26582579 +1 more
Fall asleep faster Promising early signal

Shrinks the gap between hitting the pillow and actually sleeping.

2 meta-analyses n=55 320–729 mg 5–8 wk #4/19
23853635·33865376
Strengthen your memory Likely modest benefit

Names, conversations, faces, and details stick instead of dissolving.

2 meta-analyses n=100 520–2000 mg 6–8 wk #9/42
39009081·41601871
Boost overall cognitive performance Likely modest benefit

Broad gains in memory, speed, and mental sharpness at once.

1 study n=100 2000 mg 6 wk #4/21
41601871
Increase deep, restorative sleep Faint early signal

More time in the sleep stages where your body does its heaviest repair.

2 meta-analyses n=76 729–1000 mg 3–3 wk #2/6
33865376·39252819
Sleep longer each night Not enough research

More genuine sleep hours so your body finishes its repair cycles.

2 meta-analyses n=55 320–729 mg 5–8 wk #6/12
23853635·33865376
Ease nighttime leg cramps Likely real but unnoticeable

Cramps happen less often, end faster, and hurt less when they strike.

5 meta-analyses n=698 226–300 mg 4–9 wk #1/2
22909270·31923242·32956536·34719399 +1 more
Improve overall sleep quality Not enough research

Deeper, less interrupted nights that leave you recharged by morning.

6 meta-analyses n=317 226–2000 mg 4–12 wk
33865376·34719399·36620514·37520407 +2 more
Break the insomnia cycle Barely detectable

Quiets the nervous-system overdrive that keeps you wired at bedtime.

4 meta-analyses n=229 250–1000 mg 3–8 wk #4/14
23853635·33865376·39252819·40918053
Lower day-to-day anxiety Not enough research

The background hum of worry that colors everything gets quieter.

3 RCTs n=153 250–2000 mg 4–12 wk
36703238·37520407·40918053
Ease anxiety in older adults Not enough research

Quiets the health worries and body tension that build with age.

3 RCTs n=153 250–2000 mg 4–12 wk
36703238·37520407·40918053
Reduce pre-competition anxiety Not enough research

Quiets the overthinking that hijacks execution right before you compete.

3 RCTs n=153 250–2000 mg 4–12 wk
36703238·37520407·40918053
Build and maintain bone density Not enough research

Keeps mineral packed tightly into hip, spine, and whole-body bone.

1 RCT n=44 300 mg 52 wk #5/8
17018656
Reduce daily stress Probably doesn't help

Everyday pressure stops running your nervous system hot.

3 RCTs n=229 100–500 mg 4–8 wk #4/41
35631229·40918053·23853635
Sharpen reasoning and problem solving Probably doesn't help

See patterns faster and solve logic problems with less effort.

1 study n=100 2000 mg 6 wk
41601871
Reduce migraine disruption Not enough research

Headaches steal fewer workdays, social plans, and hours of patience.

2 meta-analyses n=— 250 mg 12 wk
33827421·30764890
Stay asleep through the night Not enough research

Fewer wake-ups and more unbroken hours of real rest.

2 meta-analyses n=— 320–729 mg 8 wk
23853635·33865376
Get fewer headaches and migraines Not enough research

Cuts the number of attacks per month so headache days stop piling up.

2 meta-analyses n=— 250 mg 12 wk
30764890·33827421
Slow cognitive decline in dementia Not enough research

Memory, attention, and orientation hold up longer before fading.

2 meta-analyses n=— 91.8–1200 mg 12 wk
37520407·39009081
Ease headache and migraine pain Not enough research

Dials down how intense each headache feels when it hits.

2 meta-analyses n=— 250–600 mg 12 wk
30764890·33827421

Forms & standardisation

Don't get hypnotized by expensive branding. The strongest human evidence overall comes from standard magnesium salts like oxide, citrate, chloride, and lactate, not one magical premium form.13 On labels, focus on elemental magnesium, because the compound name and the actual magnesium delivered are not the same thing.1 If bowel regularity is part of the goal, citrate often makes more practical sense, while oxide shows up often in trials but can feel rougher on the gut.13

Risk profile

Adverse events and known drug interactions

Safety events

hypermagnesemia severe
hypomagnesemia severe
tetany (carpopedal spasm) severe
gastroenteritis severe
Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) elevation severe
stroke severe
metabolic encephalopathy (altered mental status) severe
hypotension severe

Drug interactions

Esomeprazole major decreases concentration
Tetracycline major decreases effect
New Quinolones major decreases effect
Bisphosphonates major decreases effect
Clopidogrel major decreases concentration
other major increases toxicity
Semaglutide major decreases concentration
other major decreases concentration
Phenytoin moderate increases effect
Carbamazepine moderate increases effect

Co-studied with

Supplements that share evidence with magnesium

Vitaminb6 18 shared outcomes · d=0.69
Mineral 10 shared outcomes · d=0.43
Phosphatidylserine 6 shared outcomes · d=1.77
Vitaminc 6 shared outcomes · d=1.77
Vitamind 6 shared outcomes · d=1.77
Vitaminb Group 1 shared outcome
Polyunsaturatedfattyacid 1 shared outcome
Zinc 1 shared outcome
Milkprotein 1 shared outcome
Blackberry 1 shared outcome
Hawthorn 1 shared outcome
Californiapoppy 1 shared outcome

Frequently asked

Common questions

Is magnesium deficiency actually common?

Low magnesium intake is common enough that this supplement stays relevant even without hype. A lot of adults miss recommended intake, especially when your diet runs light on beans, nuts, seeds, whole grains, and leafy greens.1

What type of magnesium is best?

The best form is the one you actually tolerate and take consistently. The strongest overall human evidence comes from standard forms like citrate, oxide, chloride, and lactate, and the label number that matters most is elemental magnesium.13

Should you take magnesium at night?

Take it at night if sleep is the reason you're using it, because insomnia trials often dose in the evening or at bedtime.4 If sleep is not the goal, consistency matters more than the clock.3

How long does magnesium take to work?

Think weeks, not hours. Repletion studies often run for 4 to 12 weeks, insomnia studies usually run 3 to 8 weeks, and leg-cramp trials often assess results after about 4 weeks of daily use.345

Does magnesium help with leg cramps?

It appears to help a little, but don't expect fireworks. The best read of the evidence is a small effect at best, with studies showing modest reductions in frequency or severity rather than a dramatic stop-the-cramps result.5

Does magnesium help with stress or anxiety?

The research stays weaker here than people on the internet make it sound. Systematic-review authors found the anxiety and stress data too limited and inconsistent to support a confident conclusion.6

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Sources

  1. 1. Magnesium - Fact Sheet for Health Professionals
  2. 2. Magnesium in man: implications for health and disease (2015) ↑
  3. 3. Magnesium in Prevention and Therapy (2015) ↑
  4. 4. The effect of magnesium supplementation on primary insomnia in elderly: A double-blind placebo-controlled clinical trial (2012) ↑
  5. 5. Magnesium for skeletal muscle cramps (2020) ↑
  6. 6. The Effects of Magnesium Supplementation on Subjective Anxiety and Stress—A Systematic Review (2017) ↑

Generated May 11, 2026

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