The Health Benefits : Cod liver oil, as its name suggests, is oil extracted from the liver of cod. It is rich in Omega-3 fatty acids. You can also get omega-3 from eating foods such as tuna, herring and mackerel and by taking a supplement such as Seven Seas Cod Liver Oil One A Day although supplements should not replace a balanced diet and healthy lifestyle. As well as omega-3, cod liver oil is also a reliable source of important nutrients including vitamin A & D. These important nutrients play a crucial role in your body.Vitamin D supports the maintenance of normal bones and muscle function, and contributes to the normal function of the immune system.A source of Omega-3 : Two of the most important omega-3 fatty acids contained in fish oil are eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA).Your body can’t make them from scratch; they can be converted from alpha-linolenic acid (ALA), which is another omega-3 fatty acid, however this conversion can be inefficientvitamin D1 and therefore it is best to make sure that DHA and EPA are included as part of a balanced diet. This is why both adults and children should aim to consume two portions of fish a week, one of which should be oily. Additionally, you can also top up your diet withregular supplementation with a cod liver oil food supplement. A source of Vitamin D : Vitamin D helps to regulate the amount of phosphate and calcium absorbed by the body and helps to keep bones, teeth, and muscles healthy.Vitamin D is made by our bodies in reaction to sunlight on our skin. Most of us should be able to get vitamin D from sunlight from late March/April to the end of September. However, between October and early March we do not get any vitamin D from sunlight. In these months everyone should consider taking a daily supplement of vitamin D2.Dosage : Adults and children over 12 years: One capsule to be taken with a cold drink each day.