CBD for Anxiety
The evidence that CBD relieves anxiety is genuinely split and rated weak: the largest, highest-quality meta-analysis found no benefit, and the strongest positive signals come only from single-dose, public-speaking experiments rather than from treating a diagnosed anxiety disorder. CBD also is not a legal supplement ingredient in many places and carries real drug-interaction and liver-safety concerns.
Why this grade7-layer evidence engine
The research directly contradicts itself, which is why this lands at a weak, disputed grade rather than a clear yes or no. The largest and best-conducted synthesis to date, a 2026 meta-analysis of 54 randomized trials in 2,477 people (PMID 41856154), found no significant effect of cannabinoids on anxiety. A smaller 2024 meta-analysis (PMID 38924898) did report a large benefit, but it pooled just 316 participants with a confidence interval that barely cleared zero (Hedges g -0.92, 95% CI -1.80 to -0.04), making the estimate fragile.
The positive signals are also narrow in scope. The most consistent effects appear in acute, single-dose experiments — such as a 600 mg dose easing nerves before a simulated public-speaking task (PMID 21307846) and reviews of social-anxiety challenge studies (PMID 36875967). A narrative review of 11 trials (PMID 39598172) called the results across studies contradictory. Well-powered, longer-term trials in people with a diagnosed anxiety disorder are essentially missing, and dosing varies enormously.
Regulators and major clinics reinforce the caution. The US FDA states CBD is not an appropriate dietary-supplement or food ingredient; the UK's food regulator advises healthy adults cap intake at about 10 mg per day and that vulnerable groups avoid it entirely; and Mayo Clinic calls human evidence too limited to be definitive, while flagging drug interactions, possible liver effects, and unreliable product labeling. WHO notes a generally good safety profile but does not endorse CBD for anxiety.
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 = 0.446
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高階證據未達主導 (1 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 2 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status