What it is
Fennel fruit oil is a volatile essential oil distilled from the dried fruits of Foeniculum vulgare, characterized by a sweet, anise-like aroma driven largely by anethole. In formulations it is included at low levels primarily to impart scent, and it can contribute to a product's overall botanical positioning. Because it is a volatile aromatic oil rather than a fixed oil, it does not function as an emollient base.
Safety & warnings
As a fragrant essential oil, fennel oil can be a source of sensitization in susceptible individuals and is used at low concentrations. Anethole and other constituents may act as skin irritants or contact allergens for some people, so patch testing is reasonable for those with fragrance sensitivities. Citrus-style phototoxicity is not characteristic of fennel oil itself.
Origin & sourcing
Natural; produced by steam distillation of the fruit of fennel, an herb in the carrot family (Apiaceae) cultivated widely in the Mediterranean region and Asia.
Questions everyone asks
Why is fennel oil added to a sunscreen?
It is used mainly as a natural fragrance component to give the product a sweet, anise-like scent rather than for any sun-related function.
Is fennel oil an essential oil?
Yes, it is a volatile essential oil distilled from fennel fruit, so it carries aroma and the sensitization considerations common to fragrant plant oils.