Fennel Seed Tea
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.
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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]