Magnesium for Type 2 Diabetes
Verdict: Published with Warning
Across 6 PubMed studies, the evidence for Magnesium in Type 2 Diabetes 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 0.45
D
C
B
A
S
← counter-evidence / ineffectiveeffective / strong evidence →
Final grade
C · Published with Warning
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 = 0.452
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (3 篇 > 1 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 (6)L2 · primary research & systematic reviews
Magnesium intake and risk of type 2 diabetes: meta-analysis of prospective cohort studies
Finding: Higher magnesium intake was significantly inversely associated with incident type 2 diabetes (RR 0.78, 95% CI 0.73-0.84), with a dose-response of RR 0.86 (95% CI 0.82-0.89) per 100 mg/day increment.
View on PubMed Effect of Magnesium Supplements on Improving Glucose Control, Blood Pressure and Lipid Profile in Patients With Type 2 Diabetes Mellitus: A systematic review and meta-analysis
Finding: Across 23 RCTs (n=1,345), Mg supplementation significantly lowered fasting blood glucose (WMD -0.58 mmol/L, 95% CI -0.87 to -0.28) but had a minimal, non-significant effect on HbA1c (WMD -0.16, 95% CI -0.32 to 0.00); HbA1c benefit was greater in patients aged >=65 y and with longer supplementation.
View on PubMed The effects of oral magnesium supplementation on glycaemic control in patients with type 2 diabetes: a systematic review and dose-response meta-analysis of controlled clinical trials
Finding: In dose-response analysis of 18 RCTs, HbA1c fell -0.73% at 500 mg/day (95% CI -1.25 to -0.22, p=0.004) and at 24 weeks HbA1c -0.48 (95% CI -0.77 to -0.19) and FBS -15.58 mg/dL (95% CI -24.67 to -6.49), but authors concluded trials are insufficient to make clinical guidelines.
View on PubMed Effects of oral magnesium supplementation on glycaemic control in Type 2 diabetes: a meta-analysis of randomized double-blind controlled trials
Finding: Pooling 9 double-blind RCTs (n=370, 4-16 wk, median 360 mg/day), fasting glucose was significantly lower with magnesium (WMD -0.56 mmol/L, 95% CI -1.10 to -0.01) but HbA1c was NOT significantly changed (-0.31%, 95% CI -0.81 to 0.19); HDL rose modestly.
View on PubMed Efficacy of Magnesium Supplementation on Glycemic Control in Type 2 Diabetes Patients: A Meta-analysis
Finding: Pooling 7 RCTs, magnesium produced only a non-significant trend toward better glycaemic control (mean difference -0.19, 95% CI -0.58 to 0.21), and authors concluded routine magnesium supplementation cannot be recommended (a stronger but still non-significant trend was seen in hypomagnesaemic patients, MD -1.16, 95% CI -2.92 to 0.6).
View on PubMed Effect of magnesium supplementation on type 2 diabetes associated cardiovascular risk factors: a systematic review and meta-analysis
Finding: Magnesium supplementation significantly improved fasting plasma glucose (WMD -4.64 mg/dL, 95% CI -7.60 to -1.68, p=0.002), HDL (+3.20 mg/dL, p<0.001), LDL (-10.67 mg/dL, p=0.013), triglycerides (-15.32 mg/dL, p=0.026) and systolic BP (-3.06 mmHg, p=0.015), with larger effects in hypomagnesaemic diabetics.
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
The American Diabetes Association says there's not enough evidence to support the use of any routine magnesium supplements for glycemic control in patients with type 2 diabetes. However, if you already have type 2 diabetes, it's especially important to keep up your magnesium intake, as low magnesium can make insulin resistance worse. source↗
L5c Cleveland Clinic
Supportive
It can also help regulate your blood sugar, which helps protect you from diabetes. source↗
L5d Harvard Health
Cautious
More limited evidence suggests that extra magnesium could also be helpful for people with diabetes and diabetic neuropathy. Magnesium helps regulate the body's calcium and blood sugar levels. source↗
L5e Specialty Society (condition-mapped)
Against
Assess intake of supplements, as supplementation with micronutrients (e.g., vitamins and minerals, such as magnesium or chromium) or herbs or spices (e.g., cinnamon and aloe vera) is not recommended for glycemic benefits. source↗