, traditionally classified as a culinary and medicinal herb, Tansy is no longer recommended for internal use due to the presence of the toxic compound thujone which can cause convulsions and liver and brain damage. The herb has a long history as an effective treatment for expelling intestinal worms and treating gout and rheumatism. It is associated with death, not because of its toxic nature, but because of the plants ability to deter worms. It is a highly effective embalming agent as it greatly slows the decomposing of tissues caused by worms and bacteria. It remains a popular insect repellent for keeping away mosquitos, tics, and lice. Do not confuse tansy with tansy ragwort (Senecio species) or other plants commonly called “tansy,” including Blue Tansy (Tanacetum annuum) which is used to make Blue Tansy Essential Oil.
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