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Butterbur (Petasites hybridus)
A botanical with solid RCT evidence for migraine prophylaxis (75mg twice daily) and allergic rhinitis — but raw butterbur contains liver-toxic pyrrolizidine alkaloids, so ONLY certified PA-free extracts should ever be used.
What the evidence says
Most Butterbur studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 2002–2025 with a typical study size of 186 participants.
Based on 20 studies · 1 meta-analysis · 13 RCTs · 570 total participants
Confidence
Moderate confidenceBy outcome
Placebo-controlled RCTs and reviews show dose-dependent efficacy for migraine prophylaxis and allergic rhinitis, but the trial base is small and hepatotoxic pyrrolizidine-alkaloid safety concerns cap confidence.
12 rigorous studies
10 randomized trials · 0 meta-analyses · 2 systematic reviews
Our evidence rating for Butterbur is accountable to this entire body of rigorous research indexed in PubMed — not a hand-picked subset.
PubMed · as of Jul 2026
Butterbur (Petasites hybridus) has some of the stronger botanical evidence in its categories: a 245-patient RCT showed 75mg twice daily cut migraine frequency by 48% (vs 26% placebo), and randomized trials show it works for allergic rhinitis comparably to antihistamines without sedation.
Its actives are petasin and isopetasin. The critical caveat is safety: the raw plant contains pyrrolizidine alkaloids (PAs) that are hepatotoxic and carcinogenic, and rare liver-injury cases have been reported.
Only certified PA-free standardized extracts (e.g., Petadolex, Ze339) should be used, and even then liver monitoring is prudent — which is why professional guidelines have grown cautious despite the efficacy data.
Petasin and isopetasin inhibit leukotriene and inflammatory pathways and have antispasmodic/vasoregulatory effects relevant to migraine.
Dampens the allergic/histamine response, easing allergic-rhinitis symptoms.
Affects cerebral vascular tone, a proposed migraine-prophylaxis mechanism.
How Butterbur works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Avoid entirely.
Avoid.
Only under specialist supervision with PA-free extract.
Additive liver-injury risk, especially with non-PA-free products.
Theoretical additive effects.
Pyrrolizidine alkaloids are bioactivated by CYP enzymes — another reason to use only PA-free extracts.
Tip: Take with food; most common reported effect
Tip: Use only certified PA-free extracts; stop and seek care if jaundice/dark urine/abdominal pain
Tip: Avoid if allergic to ragweed/daisies
Butterbur has an evidence score of 6/10 — moderate evidence based on 10 indexed studies, including 1 meta-analysis. A botanical with solid RCT evidence for migraine prophylaxis (75mg twice daily) and allergic rhinitis — but raw butterbur contains liver-toxic pyrrolizidine alkaloids, so ONLY certified PA-free extracts should ever be used. Representative study: PMID 38603736.
The commonly studied dose of Butterbur is 50-75mg PA-free standardized extract twice daily for migraine prophylaxis (≈100-150mg/day); allergic rhinitis similar. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Butterbur is with meals. Take it with food. Taken with food, split into two daily doses; the 75mg-twice-daily migraine dose outperformed 50mg twice daily.
Butterbur should be used with caution — talk to a healthcare provider before taking it. The most commonly reported side effects are burping/GI upset, allergic reaction (Asteraceae), liver injury (with PA-containing products). Use caution if any of these apply to you: Liver disease; Pregnancy and breastfeeding; Allergy to ragweed/daisy family (Asteraceae).
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 20 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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