Magnesium for Fatigue
Verdict: Insufficient Evidence
Across 6 PubMed studies, the evidence for Magnesium in Fatigue grades Tier D — counter-evidence. Research is still too limited to draw a firm conclusion.
D 🔴 D Counter-Evidence Insufficient Evidence
Why this grade7-layer evidence engine
⚖️
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditableRaw score 0.31
D
C
B
A
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← counter-evidence / ineffectiveeffective / strong evidence →
Final grade
D · Insufficient Evidence
Confidence
83%
Highly consistent evidence
Evidence level
E2
Multiple high-quality MAs (≥2 independent, consistent)
▸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 = 0.308
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高階證據未達主導 (0 positive vs 1 negative)，由 raw_score 決定
- 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 (6)L2 · primary research & systematic reviews
Vitamin and mineral status in chronic fatigue syndrome and fibromyalgia syndrome: A systematic review and meta-analysis
Finding: Magnesium status did not differ from controls and no mineral supplement (incl. magnesium) was shown effective; only vitamin E reached significance (SMD -1.57, 95%CI -3.09 to -0.05, p=.042) and that vanished in high-quality studies.
View on PubMed Complementary and alternative medicine for patients with chronic fatigue syndrome: a systematic review
Finding: Across 26 RCTs (n=3,273) most supplements failed, with magnesium and NADH the only exceptions, but the authors graded the evidence as limited due to few/small trials and high risk of bias.
View on PubMed Magnesium and malic acid supplement for fibromyalgia
Finding: Synthesising 7 systematic reviews and 11 primary studies (1 RCT), the authors concluded magnesium plus malic acid 'makes little or no difference on pain and on depressive symptoms' in fibromyalgia.
View on PubMed Short-Term Magnesium Therapy Alleviates Moderate Stress in Patients with Fibromyalgia: A Randomized Double-Blind Clinical Trial
Finding: Fatigue (FSS) showed no significant between-group difference, and the primary stress endpoint was also null overall (DASS-42 21.8 vs 21.6, p=0.930); only a mild/moderate-stress subgroup (p=0.003) and pain (p=0.029) improved.
View on PubMed Effects of Coenzyme Q10, Tryptophan, and Magnesium Supplementation on Fatigue in Patients with Fibromyalgia
Finding: On the primary fatigue endpoint, fatigue improved significantly in the placebo group while the supplement (CoQ10+tryptophan+magnesium) produced only a non-significant reduction, so magnesium showed no fatigue benefit (and its effect is confounded within the combination).
View on PubMed Red blood cell magnesium and chronic fatigue syndrome
Finding: 12/15 magnesium-treated vs 3/17 placebo patients reported benefit (62% difference, 95%CI 35-90) with red-cell magnesium normalising on treatment, but this small 1991 trial has never been successfully replicated.
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
If you're low in magnesium, you might experience fatigue, weakness, nausea, loss of appetite, headaches, higher blood pressure, higher blood sugar, muscle cramps and trouble sleeping. Taking a magnesium supplement may help ease issues like muscle cramps, constipation, insomnia, high blood pressure, insulin resistance, fatigue and menstrual symptoms. source↗
L5c Cleveland Clinic
Cautious
Some of the first signs of magnesium deficiency can be: Fatigue. Loss of appetite. Muscle spasms. Nausea. Stiffness. Weakness. source↗
L5d Harvard Health
Against
Magnesium supplements are sometimes marketed as 'super-pills' that can fix a long list of ailments such as muscle tension, low energy, and trouble sleeping in people with adequate total body magnesium. The evidence to support the claims just isn't there. source↗
L5e Specialty Society (condition-mapped)
Cautious
Some studies have found that supplements of NADH, magnesium or of omega-3 fatty acids (like fish oil) may benefit patients with chronic fatigue syndrome. There's much less research about the risks and benefits from alternative treatments... It's best to talk with your doctor first, so they know all the strategies you're trying and can help you research what could work and watch out for any side… source↗