does magnesium help with depression?

the diet data say people who eat more magnesium are less likely to be depressed (34% lower risk in the highest intake group across 63,214 adults), but that is an association with diet, not a trial of a pill. the trial most often quoted, 126 primary-care adults, found a 6-point phq-9 improvement, but it compared magnesium with taking nothing and nobody was blinded, so expectation explains an unknown share of it. the one double-blind placebo-controlled trial on this page, 37 people taking magnesium or placebo on top of fluoxetine, found no difference at any point. in pregnancy and after birth, pooled trials found minerals including magnesium no better than placebo.

does magnesium help with anxiety?

the evidence is weak and the best-known review says so itself. it assembled 18 studies in groups prone to anxiety and found a benefit in about half (4 of 8 in anxious samples, 4 of 7 in premenstrual syndrome, 1 of 2 in people with high blood pressure), none in postpartum anxiety, and no study using a validated measure of subjective stress; its conclusion is that "the quality of the existing evidence is poor". two of its three authors received funding from sanofi, which sells magnesium supplements, and sanofi supplied unpublished data. in the 126-person open-label depression trial, anxiety scores also fell, with the same caveat about blinding.

is magnesium fda approved?

not for mood, anxiety or sleep. magnesium sold for those uses is a dietary supplement under the 1994 dietary supplement health and education act, so the fda does not review it for safety or effectiveness and has never approved it for any mental-health use. fda-approved magnesium products exist for other purposes: magnesium sulfate injection for eclampsia, and magnesium hydroxide and citrate as laxatives and antacids. magnesium is also an essential nutrient with a recommended dietary allowance of roughly 310 to 420 mg a day for adults and a tolerable upper limit of 350 mg a day from supplements.

how much magnesium is too much?

the tolerable upper intake level from supplements specifically is 350 mg of elemental magnesium a day, set by the national academies; it does not apply to magnesium in food. above it the predictable effect is diarrhoea, loose stools, cramping and nausea, most with the oxide and citrate salts. the dangerous case is reduced kidney function, where excess magnesium cannot be cleared and can cause low blood pressure, muscle weakness, confusion, irregular heartbeat and in severe cases cardiac arrest. the salts differ several-fold in elemental magnesium, so the number on the bottle is not the number that matters.

what does magnesium interact with?

magnesium binds several drugs in the gut and reduces their absorption, notably tetracycline and quinolone antibiotics, bisphosphonates and levothyroxine, so doses need to be spaced apart; a pharmacist can say how far. in the one double-blind trial on this page it was taken with fluoxetine without any reported problem, and without any benefit. anyone with kidney disease has a separate question to ask before taking it at all.

Supplement evidence

Magnesium

What the trials measured, and what deficiency correction does and does not tell you.

page first published 2026-09-08 · last updated 2026-10-05

Not an FDA-approved treatmentSold as a dietary supplement5 studies on this page

What Its Legal Status Actually Means

Read this before anything below it. Legal to sell is not the same fact as reviewed, verified, or approved.

Oral magnesium sold for mood, anxiety, or sleep is a dietary supplement under the Dietary Supplement Health and Education Act of 1994 (DSHEA). The FDA does not review it for safety or effectiveness before sale, does not verify label content, and has never approved any magnesium supplement to prevent or treat depression, anxiety, or insomnia. Magnesium does have a recognised Recommended Dietary Allowance (roughly 310-420 mg/day of elemental magnesium for adults, set by the National Academies) and a Tolerable Upper Intake Level of 350 mg/day from supplements specifically, and separate FDA-approved prescription and OTC magnesium products exist for entirely different purposes — magnesium sulfate injection for eclampsia, magnesium hydroxide and citrate as laxatives and antacids. None of those approvals apply to mental health. Different salts (oxide, citrate, glycinate, threonate) differ substantially in elemental magnesium content and absorption, so doses are not interchangeable between bottles.

Quoted whole from the 2026-08-18 study harvest. Not summarized, not shortened.

does magnesium work for depression or anxiety? what the trials say

there is no fda label for magnesium sold for mood or sleep, because in the united states it is a dietary supplement that has never been reviewed for those uses; the magnesium products the fda has approved (magnesium sulfate injection for eclampsia, magnesium hydroxide and citrate as laxatives and antacids) are different products for different purposes. the regulatory facts below come from the legal-status paragraph above, written from the regulator’s documents in the 2026-08-18 study harvest; every trial figure is from a study record on this page. every source is linked at the end of this section. last checked 2026-10-05.

magnesium is a mineral with a recommended dietary allowance, a tolerable upper limit for supplements, and a large market for mood, anxiety and sleep. the evidence for those uses has a particular shape: the association between magnesium and depression is real and comes from what people eat; the trial that most people quote compared a magnesium pill with taking nothing, with everyone knowing which they were on; the one double-blind placebo-controlled trial on this page found nothing; and the most-cited anxiety review was paid for by a company that sells magnesium and rated its own evidence poor. this section covers each, in both directions, with the funders named. every figure is from a study record on this page or from the regulator-sourced paragraphs above and below.

this is information to take to a prescriber or pharmacist. nothing here tells anyone to take magnesium or to stop, and nothing here is a reason to put off treatment that works for depression or anxiety.

what its legal status means, and does not mean

oral magnesium sold for mood, anxiety or sleep is a dietary supplement under the 1994 dietary supplement health and education act: the fda does not review it for safety or effectiveness before sale, does not verify label content, and has never approved any magnesium supplement to prevent or treat depression, anxiety or insomnia [status]. that sits beside two facts that make magnesium different from most supplements on this site. it is an essential nutrient with a recommended dietary allowance set by the national academies, roughly 310 to 420 mg of elemental magnesium a day for adults, and a tolerable upper intake level of 350 mg a day from supplements specifically, above which the predictable effect is diarrhoea [status]. and fda-approved magnesium products do exist, magnesium sulfate injection for eclampsia and magnesium hydroxide and citrate as laxatives and antacids, none of which has anything to do with mental health [status].

the salts are not interchangeable. oxide, citrate, glycinate and threonate differ substantially in how much elemental magnesium they contain and how much is absorbed, so a dose on one bottle is not the same dose on another, and the trials on this page used different ones at different doses [status].

what the trials measured, in whom, and for how long

five records carry the evidence. the association study pooled 10 cross-sectional and 3 cohort studies of dietary magnesium intake and depression in 63,214 adults; no supplement was tested in any of them [hajhashemy-2025]. the best-known trial randomised 126 primary-care adults with mild to moderate depression (phq-9 scores 5 to 19) to six weeks of 248 mg of elemental magnesium a day and six weeks of no treatment, in either order, with nobody blinded [tarleton-2017]. the double-blind trial randomised 37 people in a depressive episode of recurrent depression to fluoxetine plus 120 mg a day of magnesium ions or fluoxetine plus placebo for eight weeks [ryszewska-2018]. a meta-analysis of 36 randomised trials of dietary interventions in pregnancy and after birth, 28 of them pooled, tested elemental minerals including magnesium against placebo for perinatal depression [tsai-2023]. and the anxiety review assembled 18 studies in groups already prone to anxiety: mildly anxious people, premenstrual syndrome, postpartum women, people with high blood pressure [boyle-2017].

what was not measured. no trial on this page tested magnesium alone, double-blind, against placebo, as a treatment for a diagnosed anxiety disorder; the perinatal analysis pooled iron, zinc and magnesium together; the anxiety review found not one study that used a validated measure of subjective stress; and the longest trial ran eight weeks [tsai-2023; boyle-2017; ryszewska-2018].

what the research says, in both directions

in favour. across 63,214 adults, people in the highest category of dietary magnesium intake had a 34% lower risk of depression than those in the lowest (relative risk 0.66, 95% ci 0.57 to 0.78), and each extra 100 mg a day of dietary magnesium went with a 7% lower risk (0.93, 0.90 to 0.96) [hajhashemy-2025]. in the 126-person trial, phq-9 depression scores improved by a net 6.0 points (95% ci 4.2 to 7.9) and gad-7 anxiety scores by 4.5 points during the magnesium periods, with the effect appearing within two weeks and the supplement well tolerated [tarleton-2017]. in the anxiety review, 4 of 8 studies in anxious samples, 4 of 7 in premenstrual syndrome and 1 of 2 in people with high blood pressure reported a benefit, and the authors called the evidence "suggestive" [boyle-2017].

against, or smaller than the badge suggests. the diet finding is an association between what people eat and how they feel, not evidence that a pill treats anything: depression itself changes appetite and diet, magnesium-rich diets are rich in everything else that comes with vegetables, nuts and whole grains, and the pooled studies were mostly cross-sectional, which cannot tell which came first [hajhashemy-2025]. the 6-point trial compared a pill with nothing, open-label; placebo responses of that size are routine in depression trials, and nothing in the design separates the magnesium from the effect of knowingly starting a treatment, so the authors’ conclusion that magnesium "is effective for mild-to-moderate depression" outruns what an unblinded trial can show [tarleton-2017]. when magnesium was tested properly, double-blind on top of fluoxetine, there was no difference from placebo on the hamilton depression scale at any point, and no difference in serum magnesium either; an exploratory model in 37 people does not overturn that [ryszewska-2018]. in the perinatal meta-analysis, elemental minerals including magnesium were not better than placebo (standardised mean difference −0.42, 95% ci −1.05 to 0.21) [tsai-2023]. and the anxiety review’s own conclusion is that "the quality of the existing evidence is poor", with magnesium having no effect on postpartum anxiety and many included studies testing it combined with up to five other ingredients [boyle-2017].

who paid. the diet meta-analysis was funded by an iranian medical university [hajhashemy-2025]; the 126-person trial by a university of vermont fund [tarleton-2017]; the double-blind trial by the polish national science centre and two academic institutions [ryszewska-2018]; the perinatal meta-analysis’s funding could not be read [tsai-2023]. the anxiety review’s acknowledgments state that two of its three authors "received funding from sanofi to conduct the initial systematic publication database search" and that "sanofi also provided access to data from 3 unpublished mg intervention studies"; the senior author sits on sanofi’s consumer healthcare advisory board, and sanofi markets magnesium supplements [boyle-2017].

what the harvest records as risks

the common and predictable adverse effect of oral magnesium is gastrointestinal: loose stools, diarrhoea, cramping and nausea, most pronounced with magnesium oxide and citrate, which is why the same salts are sold as laxatives [risks]. the serious risk is in reduced kidney function: the kidneys clear excess magnesium, and in chronic kidney disease supplementation can produce hypermagnesaemia, with low blood pressure, muscle weakness, confusion, irregular heartbeat and, in severe cases, cardiac arrest, so anyone with reduced kidney function needs medical advice before supplementing [risks]. magnesium also binds several drugs in the gut and reduces their absorption, notably tetracycline and quinolone antibiotics, bisphosphonates and levothyroxine, so spacing doses matters [risks].

the exclusions are worth knowing. intravenous magnesium sulfate for pre-eclampsia, anaesthesia and migraine was left out because it is a different drug in a different setting and says nothing about oral supplements for mood; combination products with b6, zinc or multinutrient blends were left out because the magnesium contribution cannot be isolated; and serum-magnesium correlation studies were left out in favour of the pooled dietary analysis above [exclusions].

questions for a prescriber or pharmacist about magnesium

each one comes from a warning or a study above. they are questions, not instructions; the answers depend on a history nobody here has.

the one double-blind placebo-controlled trial on this page found no difference, and the trial that found a 6-point gain compared a pill with nothing. what are you expecting magnesium to do for me?
is my diet low in magnesium? the association with depression is in what people eat, and a diet change carries everything else that comes with it.
what is my kidney function? the harvest says excess magnesium is cleared by the kidneys and can build up to dangerous levels in kidney disease.
i take an antibiotic, a bisphosphonate or levothyroxine. magnesium binds those in the gut; how far apart should the doses be?
which salt is in the bottle i have, and how much elemental magnesium is that? the tolerable upper limit from supplements is 350 mg a day, and the salts differ several-fold.
if this is for anxiety: the most-cited review was funded by a supplement maker and called its own evidence poor. what treatment with better evidence should we be talking about?
i am pregnant or postpartum. the one meta-analysis in that setting found minerals no better than placebo for depression; does that change anything?

questions people ask

does magnesium help with depression?: the diet data say people who eat more magnesium are less likely to be depressed (34% lower risk in the highest intake group across 63,214 adults), but that is an association with diet, not a trial of a pill. the trial most often quoted, 126 primary-care adults, found a 6-point phq-9 improvement, but it compared magnesium with taking nothing and nobody was blinded, so expectation explains an unknown share of it. the one double-blind placebo-controlled trial on this page, 37 people taking magnesium or placebo on top of fluoxetine, found no difference at any point. in pregnancy and after birth, pooled trials found minerals including magnesium no better than placebo.
does magnesium help with anxiety?: the evidence is weak and the best-known review says so itself. it assembled 18 studies in groups prone to anxiety and found a benefit in about half (4 of 8 in anxious samples, 4 of 7 in premenstrual syndrome, 1 of 2 in people with high blood pressure), none in postpartum anxiety, and no study using a validated measure of subjective stress; its conclusion is that "the quality of the existing evidence is poor". two of its three authors received funding from sanofi, which sells magnesium supplements, and sanofi supplied unpublished data. in the 126-person open-label depression trial, anxiety scores also fell, with the same caveat about blinding.
is magnesium fda approved?: not for mood, anxiety or sleep. magnesium sold for those uses is a dietary supplement under the 1994 dietary supplement health and education act, so the fda does not review it for safety or effectiveness and has never approved it for any mental-health use. fda-approved magnesium products exist for other purposes: magnesium sulfate injection for eclampsia, and magnesium hydroxide and citrate as laxatives and antacids. magnesium is also an essential nutrient with a recommended dietary allowance of roughly 310 to 420 mg a day for adults and a tolerable upper limit of 350 mg a day from supplements.
how much magnesium is too much?: the tolerable upper intake level from supplements specifically is 350 mg of elemental magnesium a day, set by the national academies; it does not apply to magnesium in food. above it the predictable effect is diarrhoea, loose stools, cramping and nausea, most with the oxide and citrate salts. the dangerous case is reduced kidney function, where excess magnesium cannot be cleared and can cause low blood pressure, muscle weakness, confusion, irregular heartbeat and in severe cases cardiac arrest. the salts differ several-fold in elemental magnesium, so the number on the bottle is not the number that matters.
what does magnesium interact with?: magnesium binds several drugs in the gut and reduces their absorption, notably tetracycline and quinolone antibiotics, bisphosphonates and levothyroxine, so doses need to be spaced apart; a pharmacist can say how far. in the one double-blind trial on this page it was taken with fluoxetine without any reported problem, and without any benefit. anyone with kidney disease has a separate question to ask before taking it at all.

sources for this section

the library rows link to our one-page summary of each study, with the original paper, its funding and our evidence grade on that page.

What the Research Shows

5 records from the 2026-08-18 harvest, each checked against PubMed and Europe PMC on that date. How a study was designed, how many people were in it, and who paid for it are printed above what it found, because those three facts decide how much the finding is worth.

Study 1 · 2025
- Systematic review of observational studies
- 63,214 participants
- Reputable journal
- Independently funded
- Preregistered
strong82/100
Well-supported by good-quality research.
Read this first: Entirely observational. Mostly cross-sectional studies, which cannot establish that low magnesium came before the depression rather than after it, and dietary magnesium intake is a proxy for overall diet quality, socioeconomic position, and physical activity. No supplement was tested in any of the pooled studies.
Pooling 10 cross-sectional and 3 cohort studies covering 63,214 adults, people in the highest category of dietary magnesium intake had a 34% lower risk of depression than those in the lowest (relative risk 0.66, 95% CI 0.57-0.78), and each additional 100 mg/day of dietary magnesium was associated with 7% lower risk (RR 0.93, 95% CI 0.90-0.96). This is an association between what people eat and how they feel, not evidence that a magnesium pill treats depression — depression itself changes appetite and diet quality, and magnesium-rich diets are also rich in everything else that comes with vegetables, nuts, and whole grains.
Hajhashemy Z, Shirani F, Askari G. (2025). Dietary Magnesium Intake in Relation to Depression in Adults: A GRADE-Assessed Systematic Review and Dose-Response Meta-analysis of Epidemiologic Studies. Nutrition Reviews. PMID 38812090.
How this record was checked
PubMed record 38812090 fetched via NCBI efetch 2026-08-18; title, authors, journal, year, DOI, the 63,214 participants across 10 cross-sectional and 3 cohort studies, RR 0.66 (95% CI 0.57-0.78), the per-100 mg RR 0.93 (95% CI 0.90-0.96), and PROSPERO registration CRD42024506570 confirmed verbatim from the abstract. Europe PMC core record fetched 2026-08-18 lists funding from "Isfahan University of Medical Sciences" (grant 140274) and its Student Research Committee, with no commercial sponsor, hence funding INDEPENDENT.
Study 2 · 2017
- Randomized trial
- 126 participants
- Indexed journal
- Independently funded
- Declared conflicts of interest
strong76/100
Well-supported by good-quality research.
Read this first: Open-label with a no-treatment control rather than a placebo. That single design choice makes the headline 6-point PHQ-9 improvement uninterpretable as a drug effect: placebo responses of that magnitude are routine in depression trials, and here nothing separated the magnesium effect from the effect of knowingly starting a treatment. The authors' conclusion that "magnesium is effective for mild-to-moderate depression" outruns what an unblinded design can show.
One hundred twenty-six primary-care adults with mild-to-moderate depression (PHQ-9 scores 5-19) took 248 mg of elemental magnesium daily for six weeks and no treatment for six weeks, in randomized order. PHQ-9 scores improved by a net 6.0 points (95% CI 4.2-7.9) and anxiety scores on the GAD-7 by 4.5 points during the magnesium periods, with effects appearing within two weeks and good tolerability. The crucial caveat is in the design: the control condition was no treatment at all, and neither participants nor investigators were blinded, so a large share of that 6-point improvement is the expectation of being treated.
Tarleton EK, Littenberg B, MacLean CD, Kennedy AG, Daley C. (2017). Role of magnesium supplementation in the treatment of depression: A randomized clinical trial. PLOS ONE. PMID 28654669.
How this record was checked
PubMed record 28654669 fetched via NCBI efetch 2026-08-18; title, authors, journal, year, DOI, N=126 randomized (112 providing analyzable data), the 248 mg elemental magnesium dose, the six-week crossover periods, and the PHQ-9 (-6.0, CI -7.9 to -4.2) and GAD-7 (-4.5, CI -6.6 to -2.4) results confirmed verbatim from the abstract; the record's competing-interests statement reads "The authors have declared that no competing interests exist." Europe PMC core record fetched 2026-08-18 lists the funder as "the Henry and Carleen Tufo fund of the University of Vermont", hence funding INDEPENDENT.
Study 3 · 2023
- Meta-analysis of randomized trials
- Reputable journal
- Funding not established
- Preregistered
moderate69/100
Reasonable evidence with real limitations.
Read this first: The mineral analysis pooled iron, zinc, and magnesium together rather than testing magnesium alone, and the population was perinatal, so this is a null result in a specific setting rather than a definitive negative for magnesium in depression generally. The wide confidence interval reflects few trials.
Across 36 randomized trials of dietary interventions for depression and anxiety in pregnancy and after birth, 28 of them pooled, elemental minerals including magnesium were not superior to placebo for perinatal depression (standardized mean difference -0.42, 95% CI -1.05 to 0.21 — a confidence interval that crosses zero). Omega-3 fatty acids also failed; only vitamin D produced a small-to-medium benefit in postpartum depression.
Tsai Z, Shah N, Tahir U, et al. (2023). Dietary interventions for perinatal depression and anxiety: a systematic review and meta-analysis of randomized controlled trials. American Journal of Clinical Nutrition. PMID 37019362.
How this record was checked
PubMed record 37019362 fetched via NCBI efetch 2026-08-18; title, authors, journal, year, DOI, the 36 included and 28 pooled studies, the elemental-metals estimate (SMD -0.42, 95% CI -1.05 to 0.21), the vitamin D result, and PROSPERO registration CRD42020208830 confirmed verbatim from the abstract. Europe PMC core record fetched 2026-08-18 returned no grant or funding list and the publisher page was not retrievable, so funding is recorded UNKNOWN rather than inferred.
Study 4 · 2018
- Randomized trial
- 37 participants
- Indexed journal
- Independently funded
- Declared conflicts of interest
strong74/100
Well-supported by good-quality research.
Read this first: The authors' own stated limitation is the small sample: 37 people cannot rule out a modest real benefit, so this is an absence of evidence rather than firm evidence of absence. The 120 mg/day dose is also low relative to the 248 mg used in the Tarleton trial, which the authors themselves flag as a possible explanation.
Thirty-seven patients with recurrent depressive disorder in a depressive episode were randomized, double-blind, to fluoxetine plus 120 mg/day of magnesium ions or fluoxetine plus placebo for eight weeks. There was no significant difference between the groups on the Hamilton Depression Rating Scale at any point, and no difference in serum magnesium either. A secondary multivariate model suggested magnesium augmentation was among several factors associated with better odds of response, but that is an exploratory analysis in 37 people and does not overturn the trial's negative primary result.
Ryszewska-Pokraśniewicz B, Mach A, Skalski M, et al. (2018). Effects of Magnesium Supplementation on Unipolar Depression: A Placebo-Controlled Study and Review of the Importance of Dosing and Magnesium Status in the Therapeutic Response. Nutrients. PMID 30081500.
How this record was checked
PubMed record 30081500 fetched via NCBI efetch 2026-08-18; title, authors, journal, year, DOI, N=37, the 120 mg/day magnesium aspartate dose, the eight-week double-blind design, and the finding of "no significant differences in either Hamilton Depression Rating Scale (HDRS) scores or serum magnesium levels at any stage of treatment" confirmed verbatim from the abstract; the record's conflict statement reads "All authors declare no conflict of interest." Europe PMC core record fetched 2026-08-18 lists Polish National Science Centre grant NCN2012/07/B/NZ7/04375 and statutory funding from the Medical University of Warsaw and the Institute of Pharmacology PAS, hence funding INDEPENDENT.
Study 5 · 2017
- Systematic review of randomized trials
- Indexed journal
- Industry funded
- Declared conflicts of interest
early signal49/100
Suggestive but preliminary. Not settled.
Read this first: The acknowledgments state that two of the three authors "received funding from Sanofi to conduct the initial systematic publication database search" and that "Sanofi also provided access to data from 3 unpublished Mg intervention studies"; the senior author separately discloses membership of the Sanofi Consumer Healthcare Advisory Board. Sanofi markets magnesium supplements, so the sponsor had a direct commercial interest in the review's conclusion, and unpublished sponsor-held data entered the evidence base without independent scrutiny. Many included studies tested magnesium combined with up to five other ingredients.
The most-cited review of magnesium for anxiety included 18 studies, all in groups already vulnerable to anxiety (mildly anxious, premenstrual syndrome, postpartum, hypertensive). The tally was mixed rather than convincing: 4 of 8 studies in anxious samples, 4 of 7 in PMS samples, and 1 of 2 in hypertensive samples reported a benefit, magnesium had no effect on postpartum anxiety, and not one study used a validated measure of subjective stress. The authors' own conclusion is that the evidence is "suggestive" but that "the quality of the existing evidence is poor."
Boyle NB, Lawton C, Dye L. (2017). The Effects of Magnesium Supplementation on Subjective Anxiety and Stress-A Systematic Review. Nutrients. PMID 28445426.
How this record was checked
PubMed record 28445426 fetched via NCBI efetch 2026-08-18; title, authors, journal, year, DOI, the 18 included studies, the 4/8, 4/7 and 1/2 positive-study tallies, the null postpartum result, and the "quality of the existing evidence is poor" conclusion confirmed verbatim from the abstract, along with the conflict statement naming L.D.'s Sanofi Consumer Healthcare Advisory Board membership. Europe PMC full text (PMC5452159) retrieved 2026-08-18: the Acknowledgments read "The authors N.B. and C.L. received funding from Sanofi to conduct the initial systematic publication database search of the effects of Mg on subjective stress and anxiety. Sanofi also provided access to data from 3 unpublished Mg intervention studies", hence funding INDUSTRY and independent false.

The Risks

Nobody checks this purchase the way a prescription is checked. No prescriber reviews it against the rest of what you take, no pharmacist screens the interaction, and no regulator confirms the dose in the capsule before it is sold. That is why this section sits here at full length rather than as a footnote.

What the paragraph below covers:

Heart and blood pressure
Drug interactions
Stomach and gut

The common and predictable adverse effect of oral magnesium is gastrointestinal: loose stools, diarrhoea, cramping and nausea, most pronounced with magnesium oxide and citrate, which is why the same salts are sold as laxatives. Anyone with reduced kidney function needs medical advice before supplementing, because the kidneys are the route by which excess magnesium is cleared, and in chronic kidney disease supplementation can produce hypermagnesaemia, causing low blood pressure, muscle weakness, confusion, irregular heartbeat, and in severe cases cardiac arrest. Magnesium binds several drugs in the gut and reduces their absorption — notably tetracycline and quinolone antibiotics, bisphosphonates, and levothyroxine — so spacing doses matters. On efficacy, the honest picture is that the strongest-looking depression trial was open-label with no placebo, the best-known anxiety review was funded by a company that sells magnesium and rated its own evidence as poor quality, a properly double-blind placebo-controlled trial of magnesium added to fluoxetine found no difference, and a meta-analysis in perinatal depression found elemental minerals no better than placebo. The reliable association between magnesium and depression comes from observational dietary studies, which cannot show that taking a supplement fixes anything.

What Is Not Known

The boundaries of the section above, in the harvest’s own words. What it excluded, why, and where it looked and found nothing. An absence of evidence is not evidence of absence, and it is not evidence of benefit either.

What Was Left Out, and Why

Quoted from the harvest, where these notes sat above the study list rather than after it. Where a note says “below” it means the studies in the section above.

Magnesium sulfate trials in obstetrics (pre-eclampsia/eclampsia), anaesthesia, and migraine excluded: intravenous magnesium as an anticonvulsant or analgesic is a different drug in a different setting and tells a reader nothing about oral supplements for mood.
Combination-supplement trials (magnesium plus vitamin B6, zinc, or multinutrient blends) excluded because the magnesium contribution cannot be isolated.
Cross-sectional serum-magnesium/depression correlation studies excluded in favour of the pooled observational analysis below, which subsumes them.

The Retraction Check

PubMed efetch records for all five PMIDs inspected 2026-08-18 for "Retraction in", "Expression of concern", "Erratum in", and "Withdrawn" flags; none present.

Questions for a Prescriber or Pharmacist

This page does not tell anyone to take Magnesium or to avoid it. It is not able to: it does not know what else you take, what you have tried, or what you are treating. These are the questions each study above raises, written to be asked out loud.

The magnesium-and-depression link comes from what people eat, not from supplements — is there any reason to think a pill would do what a better diet appears to be associated with?
This trial compared taking magnesium against taking nothing, with everyone knowing which they were on — how much of that improvement would you expect from any pill in that setup?
In the population where this was tested properly against placebo, magnesium and similar minerals didn't beat placebo — does that change what you'd suggest for me?
When magnesium was tested double-blind on top of an antidepressant, it made no difference to depression scores — is adding it to my treatment worth it, or just an extra pill?
About half the studies in the main magnesium-and-anxiety review found nothing, and the review was paid for by a supplement company — what would you want to see before I rely on it?

And the one to ask at the counter, whatever the answers above turn out to be: given everything I am already taking, what would you want to know about Magnesium before I put it in the same body?

Open Magnesium in veisund

The app has the resources behind this page and people working through the same questions.What you post there goes to people, not to a model. If someone answers, it is a person who has been there. The one automated message is a crisis-resource reply.

Where This Page Comes From

Transcribed from the study-harvest-2026-08-18 record for magnesium, built into this page by scripts/supplement-ingest.mjs on 2026-09-07. Nothing here is fetched at page load, and nothing here was written by a model without a citation behind it.

Source file	study-harvest/2026-08-18/magnesium.yaml
Source repo	REPTechnologies/avalo-backend
SHA-256	3d32fd414870ea77b1d57ba4ad6493dc2eae25203329b6b84c70bd7a4be1b854
Also searched as	magnesium glycinate, magnesium citrate, magnesium oxide, magnesium chloride, magnesium aspartate, magnesium L-threonate, Magtein, Epsom salts

The Other Substances

Do any supplements actually work? asks the question across all of them. The full library has the medication records, the funding investigations, and the glossary.