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Although vervain is thought to be a relatively safe herb, it has not undergone any meaningful safety testing at a modern scientific level. There is some reason to believe it may not be safe for use in pregnancy. 1 Despite its reputation for enhancing flow of breast milk, safety in nursing women has also not been established. Additionally, safety in young children or people with severe liver or kidney disease remains unknown.
- Newall CA, Anderson LA, Phillipson JD. Herbal Medicines: A Guide for Health-Care Professionals. London: The Pharmaceutical Press; 1996:263.