Do Patients With Fish or Shellfish Allergy Tolerate the Consumption of Fish Oil Supplements? A Clinical Study

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.