The leaves of the plant are used. Traditionally used as an antispasmodic, antiseptic, digestive and diuretic. It contains 0.5-1% essential oil formed by ESTRAGOLE (Fraternale 2015), with genotoxic and cytotoxic effects (Ding 2015, Andrade 2015), METHYEUGENOL, with cytotoxic effect (Herrmann 2014, Groh 2016) and LIMONENE, with hepatotoxic effect ( Zárybnický 2017). For this reason, the essential oil should not be used at all systemically (Kalantari 2013). Do not use tarragon infusions or essential oil while breastfeeding. Tarragon is used in many western cuisines as a flavouring agent and does not produce toxicity when consumed at culinary doses. Tarragon, when used in cooking is therefore compatible with breastfeeding.