Lemon Balm for Anxiety
Lemon balm (Melissa officinalis) shows promising early evidence for easing mild anxiety and stress, but the data come from small, short, often combination-product trials, so it is not a proven treatment for moderate or chronic anxiety disorders.
Why this grade7-layer evidence engine
This claim earns a Preliminary Evidence (B) grade rather than anything stronger because the human-trial base is thin. A 2021 systematic review and meta-analysis (PMID 34449930) did find lemon balm significantly lowered anxiety and depression scores versus placebo (SMD -0.98, 95% CI -1.63 to -0.33; p=0.003), but the authors themselves flag high between-study heterogeneity and a wide confidence interval, so the true effect size is uncertain.
The supporting randomized trials are small and short: 80 cardiac patients on 3 g/day over 8 weeks (PMID 29908682), 100 adults on a 400 mg/day phospholipid-carrier extract for just 3 weeks (PMID 37927585), and an 18-person single-dose lab-stress study where only the 600 mg dose raised self-rated calmness (PMID 15272110). Several used standardized or combination formulations and had undisclosed funding, making it hard to attribute benefit to lemon balm alone. An independent re-grade placed the evidence at C, one notch below Examine's B.
Regulators and clinics reinforce the cautious tone. The US FDA lists balm-leaf extract only as a GRAS flavoring agent, not an efficacy endorsement, and the EMA monograph covers traditional use for mild stress and sleep rather than proven treatment. Cleveland Clinic calls anxiety relief lemon balm's best-known use yet explicitly warns it is not appropriate for severe or chronic anxiety, while Mayo, Harvard, and the major anxiety specialty societies do not address or back it. It may also add to the sedation of CNS depressants such as benzodiazepines.
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 = 0.574
- 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