Cod liver oil is a dietary supplement that has been used since the 1700's. [1] Today it's commonly taken as a omega-3 fat supplement (specifically EPA and DHA). In addition, cod liver oil has fairly high levels of Vitamin A and Vitamin D. [2] People may take cod liver oil for a variety of reasons including: alleviating arthritis related pain and joint stiffness, prevention of coronary artery disease, promote or improve cognitive function, manage blood pressure and improve cholesterol and ... Cod liver oil can be obtained from eating fresh cod liver or by taking supplements. Cod liver oil is used as a source of vitamin A and vitamin D, and to treat high cholesterol and high triglyceride levels, kidney disease in people with diabetes, high blood pressure, heart disease, osteoarthritis, rheumatoid arthritis, depression, an autoimmune disease called systemic lupus erythematosus (SLE), glaucoma, and middle ear infections (otitis media). It is also used to prevent respiratory ... Cod liver oil , rich in omega-3s, vitamins A and D, offers significant heart benefits. It combats inflammation, balances cholesterol by lowering trigly Cod liver oil is rich in important nutrients, but the supplements have potential risks. Experts discuss the benefits, side effects, and dosage.