There is insufficient evidence to verify that cod liver oil is good for health conditions. Some unofficial studies have shown that cod liver oil helps health conditions, including glaucoma, heart disease, lupus, high blood pressure, and kidney disease in diabetics, states WebMD.
Patients can eat fresh cod liver or take supplements to obtain the oil, which contains fatty acids that prevent blood clotting and reduce pain and inflammation. Other uses of cod liver oil include applying it on a wound for faster healing. When taken orally, it also helps reduce high levels of triglycerides, a type of fat in the blood, by 20 to 50 percent, according to WebMD. After using the oil, people with Type 2 diabetes have seen decreases in their urine protein levels, an kidney disease indicator.