The purpose of this clinical study is to test whether patients with fish or shellfish allergy can ingest different types of fish oil supplements without having an allergic reaction. To achieve this, the recruited participants will be asked to: * provide a blood sample (used for Basophil Histamine Release Assay) * undergo a skin-prick-test * partake in multiple oral provocations These three tests will indicate the likelihood that the participants can consume fish oil supplements without adverse allergic reactions (See the detailed description for an explanation of the tests). The investigators will test the participants tolerance for three different types fish oil supplements: Fish oil, Cod liver oil, and krill oil.
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Allergic reactions during fish oil provocation.
Timeframe: At 2 hours after the provocation or at the end of the provocation if terminated early (in case of allergic reaction).
Allergic reactions during cod oil provocation.
Timeframe: At 2 hours after the provocation or at the end of the provocation if terminated early (in case of allergic reaction).
Allergic reactions during krill oil provocation.
Timeframe: At 2 hours after the provocation or at the end of the provocation if terminated early (in case of allergic reaction).