Magnesium for Insomnia
Magnesium shows a small, inconsistent signal for improving sleep in people with insomnia, but the evidence is weak and no major health authority or sleep-medicine guideline currently endorses it for this use. If you want to try it, treat it as a low-stakes experiment rather than a proven remedy, and prioritize first-line approaches like cognitive behavioral therapy for insomnia (CBT-I).
Why this grade7-layer evidence engine
This claim earns a Weak (Tier C) rating because the better-quality evidence points in the right direction but is thin and shaky. A 2021 meta-analysis (PMID 33865376) found magnesium shortened sleep-onset latency by about 17 minutes versus placebo (p=0.0006), and a 2025 double-blind RCT (PMID 40918053, n=155) reported a slightly larger drop in Insomnia Severity Index scores than placebo (-3.9 vs -2.3, p=0.049). However, that benefit was barely statistically significant with a very small effect size (Cohen's d 0.2), the trials were small (n=80-155), and both recent RCTs (PMIDs 40918053, 39252819) were industry-funded.
The signal is further undercut by inconsistency. A 2023 systematic review (PMID 35184264) concluded that while observational data link magnesium status to sleep quality, the randomized trials report contradictory findings. Because two of the supporting trials were industry-sponsored, the engine also flagged a funding-bias concern, which is a common reason to discount otherwise positive results in this field.
Crucially, no authority endorses magnesium specifically for insomnia. Regulators classify it only as a nutrient (US FDA, EU EFSA), and the NHS notes most people get enough from food. Clinical sources are uniformly cautious: Mayo Clinic says the sleep benefit "hasn't been proven in human studies," Harvard Health calls the evidence "limited," and the American Academy of Sleep Medicine notes there is "little research" and does not recommend it, favoring CBT-I as first-line care. Together this supports a cautious, weak-evidence verdict rather than a stronger one.
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditable▸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 = 0.544
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 無高階證據可裁決
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 1 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status