Fennel is a sweet-smelling perennial herb with yellow flowers which is native to the Mediterranean but is now found all around the world. Fennel seeds from which the tea is derived contain essential oil, the main constituents of which are anethole and fenchole.
1 http://www.webmd.com/vitamins-supplements/ingredientmono-311-fennel.aspx?activeingredientid=311&activeingredientname=fenne
2 http://www.ncbi.nlm.nih.gov/pubmed/12868253
3 http://www.uofmhealth.org/health-library/hn-2089002
4 http://www.uofmhealth.org/health-library/hn-2089002
Tanira MOM, Shah AH, Mohsin A, et al. Pharmacological and toxicological investigations on Foeniculum vulgare dried fruit extract in experimental animals. Phytother Res 1996;10:33-6.
5 Ostad SN, Soodi M, Shariffzadeh M, Khorshidi N, Marzban H. The effect of fennel essential oil on uterine contraction as a model for dysmenorrhea, pharmacology and toxicology study. J Ethnopharmacol. 2001;76:299–344. [PubMed]
6 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3611645/
7 http://www.ncbi.nlm.nih.gov/pubmed/23240972
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