So-called true aniseed oil, which is extracted from aniseed fruits by steam distillation. This oil is quite expensive and rare. More commonly used is star anise oil, see Oleum anisi stellati .
Its quality is specified in the European Pharmacopoeia (Ph. Eur.).
HMPC monograph: Traditional-use: Mild spasmodic gastrointestinal complaints, flatulence, flatulence; expectorant for coughs due to colds
ESCOP monograph: Dyspeptic complaints, mild spasmodic gastrointestinal complaints, flatulence, flatulence; mild inflammation of the upper respiratory tract, expectorant
Commission E monograph: Internal: Dyspeptic complaints; Internal and external: Catarrh of the respiratory tract