Common side effects of ingesting cod liver oil include nosebleeds, bad breath, heartburn, belching and bloating, as listed by WebMD. High doses may cause loose stools, nausea and an increased chance of bleeding.
Ingesting cod liver oil supplements with meals may help decrease unwanted side effects, according to WebMD. When taken in large doses, cod liver oil may cause elevated levels of vitamins A and D, or prevent blood from clotting and increase risk of bleeding. Because cod liver oil can lower blood pressure, Individuals taking high blood pressure medications should consult with a doctor before using cod liver oil supplements. As of 2015, insufficient research exists concerning the safety of cod liver oil usage in pregnant or breastfeeding women.
Individuals should speak with a doctor if any of the most common side effects of cod liver oil become bothersome or don't go away on their own, as advised by Drugs.com. People taking cod liver oil should seek immediate medical attention if they experience symptoms of an allergic reaction, such as itching, difficulty breathing, chest tightness, hives or facial swelling. Additionally, people using cod liver oil should seek medical care if they experience skin numbness, skin tingling or whole-body swelling.