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Osha is believed to be safe, although the scientific record is far from complete. Traditionally, it is not recommended for use in pregnancy. Safety in young children, nursing women, or those with severe liver or kidney disease has also not been established.
One potential risk with osha is contamination with hemlock parsley, a deadly plant with a similar appearance. 1
- Moore M. Medicinal Plants of the Mountain West: A Guide to the Identification, Preparation, and Uses of Traditional Medicinal Plants Found in the Mountains, Foothills, and Upland Areas of the American West. 1st ed. Santa Fe, NM: Museum of New Mexico Press; 1979:119.