Cod Liver Oil 1000mg. This all adds to the cost but we think it's important. Reassuringly our oils far exceed the strict quality standards. Vitamin D contributes to the normal function of the immune system.PLUS, VITAMIN E - We’ve also fortified our oil with vitamin E at 50% NRV because of its antioxidant properties and included a safe level of vitamin A 800µg (100% NRV), to the formula.