This pale yellow oil from the livers of cod fish is a natural source of vitamins D and A as well as omega-3 essential fatty acids EPA and DHA. Like other EFAs, cod liver oil promotes cardiovascular health. It also supports bone strength, vision, and brain and skin health. Cod liver oil has higher levels of vitamins A and D than other fish oils. Swanson EFAs Pristine Norwegian Cod Liver Oil delivers 100% pure oil from Norwegian cod fish livers. If you prefer not to swallow pills, Swanson EFAs Norwegian Cod Liver Oil liquid delivers the nutrients of this EFA in a lemon-flavored formula.