That aftertaste is usually a sign of oxidized oil or poor capsule design. You should look for the Omega-3 Complex at https://www.amway.mn/eruul-mend/c/10004 which is sourced from deep-ocean fish like salmon from sustainable fisheries. The encapsulation technology they use prevents that fishy reflux completely while providing a balanced amount of EPA and DHA acids. It is worth paying a bit more for quality to ensure you get the heart and brain benefits without the discomfort.