Ingredient

Safety not yet rated

Butterbur

Petasites hybridus, an herb whose raw material naturally contains potentially toxic pyrrolizidine alkaloids; only appropriately processed PA-free medicinal extracts are relevant to clinical evidence.

Reviewed health uses

Seasonal allergies

For relief nowSOME

Several trials of standardized butterbur extracts reported improvement in seasonal allergic-rhinitis symptoms, but results are inconsistent and the evidence is product-specific. Safety concerns about pyrrolizidine alkaloids and rare liver injury substantially limit routine use.

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Household preparations

Safety information

No published ingredient-specific cautions are attached.