Made from the liver of Gadus morhua, Cod Liver Oil has been used for centuries for protection from extreme weather. Today, it’s used for relieving stiff muscles, aching joints, and rheumatism. Cod Liver Oil may even lower the risk of type 1 diabetes because of its high omega-3 fatty acids count. Because Cod Liver Oil lowers inflammation, it could be used to alleviate some symptoms of depression and anxiety. Some animal studies show that it could treat ulcers, especially those in the gut and stomach.