Tansy (tanacetum vulgare) It is a good source of vitamin C and minerals like calcium, magnesium, sodium, iron and sulfur. Herbalist use it in treating intestinal worms, thread worms and round worms in adults and children. Also used in the treatment of kidney stones and menstrual irregularities. Good natural remedy for intestinal and stomach ulcers, bloating, gas and gallbladder problems. It's a good appetite stimulant. Also useful for rheumatism, arthritis, nerve pain, migraines and sciatica. NOTE: The leaves and flowers are toxic if consumed in large quantities; the volatile oil contains toxic compounds including thujone, which can cause convulsions and liver and brain damage. Use only as recommended.