Magnesium for Depression
Verdict: Published with Warning
Across 4 PubMed studies, the evidence for Magnesium in Depression grades Tier C — weak evidence. Effective, but with safety or population caveats.
C 🟠 C Weak Evidence Published with Warning
Why this grade7-layer evidence engine
⚖️
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditableRaw score 0.54
D
C
B
A
S
← counter-evidence / ineffectiveeffective / strong evidence →
Final grade
C · Published with Warning
Confidence
79%
Broadly consistent
Evidence level
E3
Single high-quality meta-analysis
▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.542
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (1 篇 > 0 negative)
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status
PubMed studies (4)L2 · primary research & systematic reviews
Magnesium supplementation beneficially affects depression in adults with depressive disorder: a systematic review and meta-analysis of randomized clinical trials
Finding: Pooled across 7 RCTs (8 effect sizes), magnesium significantly reduced depression scores (SMD -0.919, 95% CI -1.443 to -0.396, p=0.001), but heterogeneity was high (I-squared=75.6%) and only 2 of 7 trials were low-risk-of-bias.
View on PubMed Role of magnesium supplementation in the treatment of depression: A randomized clinical trial
Finding: Largest trial to date found a clinically meaningful net PHQ-9 improvement of -6.0 points (95% CI -7.9 to -4.2, p<0.001), but it was open-label with a no-treatment (not placebo) control, so expectancy bias cannot be excluded.
View on PubMed Effect of magnesium supplementation on depression status in depressed patients with magnesium deficiency: A randomized, double-blind, placebo-controlled trial
Finding: The only double-blind placebo-controlled trial showed greater BDI-II reduction with magnesium (-15.65 +/- 8.9) than placebo (-10.40 +/- 7.9, p=0.02), but it was small and restricted to magnesium-deficient patients, limiting generalizability.
View on PubMed Efficacy and safety of oral magnesium supplementation in the treatment of depression in the elderly with type 2 diabetes: a randomized, equivalent trial
Finding: Magnesium was statistically equivalent to imipramine for depression (GDS 11.4 +/- 3.8 vs 10.9 +/- 4.3, between-group p=0.27), but with only 23 patients and no placebo arm it cannot establish efficacy versus no treatment.
View on PubMed Regulatory & authoritative positionsL4/L5 · FDA / EMA / NIH ODS / Cochrane / Mayo …
L4a US FDA
Supportive
NUTRIENT SUPPLEMENT source↗
L4b EU EFSA
Supportive
a cofactor of more than 300 enzymatic reactions source↗
L4c UK NHS
Cautious
You should be able to get all the magnesium you need by eating source↗
L4d TW TFDA / 衛福部
Supportive
每日食用量中鎂含量不超過600mg source↗
L4e WHO
Supportive
magnesium sulfate injections can be given to reduce the risk of eclampsia source↗
L5a NIH Office of Dietary Supplements
Supportive
Magnesium is a cofactor in more than 300 enzyme systems source↗
L5b Mayo Clinic
Cautious
Magnesium, in any form, might help with anxiety and depression, as it is necessary to make serotonin, a neurotransmitter that affects mental health and mood. While magnesium is often marketed to help with relaxation, sleep and mood, it hasn't been proven in human studies. source↗
L5c Cleveland Clinic
Cautious
Cortisol is very important for acute stress, but in times of chronic stress, it can actually worsen depression and anxiety. ... There's some evidence to suggest magnesium can be beneficial for managing anxiety and stress — though more research is needed. ... Supplements like magnesium aren't a suitable replacement for professional medical care. source↗
L5d Harvard Health
Cautious
Unless you have a diagnosed or suspected magnesium deficiency, or a condition with clear evidence of benefit such as preeclampsia or Crohn's disease, there's no compelling reason to routinely take a magnesium supplement. Many studies of the potential benefits of magnesium are quite small, and some have inconsistent results. source↗
L5e Specialty Society (condition-mapped)
Cautious
Research increasingly demonstrates that whole foods and nutrient-dense diets are likely to provide better mental health outcomes than supplementation of isolated nutrients. Dietary supplements should be considered only as adjuncts to conventional care and used cautiously, ensuring no contraindications with prescribed psychotropic medications. source↗