Concentrated versions of fennel seeds oils can be obtained through extraction. Every kind of natural oil has strong compounds in it. When used excessively, they can have negative effects. In 2015, an animal research study discovered that mice treated with high doses of fennel seed oils had elevated female hormones. It is unknown how much fennel seeds would require to be consumed or if they have the same impact on humans. Additionally, fennel seed allergies are a possibility. Further studies are required to determine the potential advantages and disadvantages of fennel seeds.

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