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No clear toxicity has been associated with yarrow. 1 The FDA has expressed concern about a toxic constituent of yarrow known as thujone and permits only thujone-free yarrow extracts for use in beverages. Nonetheless, the common spice sage contains more thujone than yarrow, and the FDA lists sage as generally recognized as safe.
Safety in young children, pregnant or nursing women, or those with severe liver or kidney disease has not been established.
- Newall CA, Anderson LA, Phillipson JD. Herbal Medicines: A Guide for Health-Care Professionals. London, England: Pharmaceutical Press; 1996:272.