5-HTP for Anxiety
The evidence that 5-HTP relieves anxiety is weak and outdated, resting on a handful of small trials from 1985 to 2004 with mixed results. It should not be regarded as a proven treatment for anxiety disorders, and it carries real safety concerns.
Why this grade7-layer evidence engine
This claim earns a Weak (C) grade because the entire human evidence base is just four small, old randomized trials and none provide convincing proof for clinical anxiety. The most positive result is narrow: a single 200 mg dose blunted carbon-dioxide-induced panic in panic disorder patients but did nothing in healthy volunteers (PMID 12559480). A parallel challenge study using CCK-4 failed to reach significance (19% vs 44% panic, p=0.13), with only a non-significant trend and an effect seen in women alone (PMID 15260907).
Crucially, these are acute panic-provocation experiments, not tests of sustained, real-world anxiety treatment. The only trials of ongoing therapy are weak: 5-HTP was clearly outperformed by the drug clomipramine on every measure (PMID 3312397), and the remaining study was an uncontrolled open-label trial of just 10 people (PMID 3157732). Effect sizes were generally not reported, sample sizes were tiny, and no modern RCTs exist.
No health authority or major clinic endorses 5-HTP for anxiety. The US FDA states it cannot determine that 5-HTP and related compounds are safe for use as dietary supplements, reflecting their link to the 1989 eosinophilia-myalgia syndrome outbreak, and EFSA has authorized no health claims. Mainstream clinics (Mayo, Cleveland Clinic, Harvard, NIH ODS) do not address it for this use. Serotonin-syndrome risk when combined with SSRIs, SNRIs, MAOIs, or triptans is a further reason for caution.
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 = 0.448
- 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 + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status