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 neem extract or oil

Extract from leaves of the neem tree, it has potential toxic effects, although it also has been shown to have antimicrobial properties (Sources: Life Sciences, January 2001, pages 1153–1160; Journal of Ethnopharmacology, August 2000, pages 377–382; Phytotherapy Research, February 1999, pages 81–83; and Mutation Research, June 1998, pages 247–258).