Fish oil supplements are dietary supplements that contain oil from the fatty flesh of cold water fish such as mackerel, anchovy, and sardines. The active ingredients in fish oil supplements are essential fatty acids known as omega-3 fatty acids. They typically include eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). These fatty acids are converted by the body into the beneficial series 3 prostaglandins. Cod liver oil, are derived from the livers of white fish, such as cod and sometimes halibut. Fish liver oils, such as cod liver oil contains vitamins A and D and has a different concentration of EPA and DHA than fish oils derived from the fat of cold water fish. Cod liver oil has a higher ratio of DHA to EPA, while fish oils have a higher ratio of EPA to DHA. But, overall, fish oils have almost twice the amount of total EPA plus DHA than cod liver oil per same size capsule or teaspoon. To summarize, cod liver oil has the additional Vitamins A and D, a higher ratio of DHA to EPA, but almost half as much total EPA plus DHA than fish oils. Practically speaking, they are both healthy to ingest, but if you want a higher concentrated form of EPA and DHA, you would go with fish oils.

Buy Cod Liver Oil supplement
With naturally occurring vitamins A & D
Promotes normal bone formation, vision and reproduction.
Dietary Supplement

Cod liver oil is one of Nature's richest sources of Vitamins A and D. Both vitamins are involved in the cycles of mineral and hormone balance which help to maintain normal bone formation and density.* In addition, Vitamin A is an important nutrient in maintaining cell membrane integrity, normal vision and reproduction.*

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Supplement Facts:
Vitamin A 1250 IU
Vitamin D 135 IU
Cod Liver Oil 400 mg
Recommended Dosage: Take one cod liver oil softgel daily with a meal or water.

Benefit of Cod Liver oil pills or liquid
Since it has a similar makeup to fish oils, the benefits of fish oils would apply. Since the link for fish oils provided above. In addition to the fish oil benefits, cod liver oil also has vitamin A and vitamin D which can be helpful in those who do not get enough of these vitamins.

Cancer survival
Women with solid tumors have better survival rates if they used certain dietary supplements in the year before they were diagnosed. Researchers at the University of Tromso, Norway useddata collected from participants in the Norwegian Women and Cancer study. The study analyzed data on 4,242 women who were diagnosed with their first cancer between the time they completed the questionnaires and the year 2007. The types of cancer the researchers analyzed in the study were solid tumor cancers including lung, colorectal, and breast. The dietary supplement most often used by the Norwegian women was cod liver oil, but also included minerals and multivitamins. The women who had taken cod liver oil on a daily basis during the year before they were diagnosed with a solid tumor cancer had a 23 percent lower risk of dying during the time period studied than women who never used supplements. Further, victims of lung cancer significantly lowered their risk of death by the use of supplements—users of cod liver oil had an astounding 44 percent lower risk, and users of other supplements had a similar rate of 45 percent or 30 percent, depending on the type of supplementation and whether use was daily or occasional. September 2009 issue of the International Journal of Cancer.

Cod liver oil may reduce incidence of type I diabetes
Use of cod liver oil during the first year of life is associated with lower risk of childhood-onset type 1 diabetes: a large, population-based, case-control study.
Am J Clin Nutr. 2003.
In Norway, cod liver oil is an important source of dietary vitamin D and the long-chain n-3 fatty acids eicosapentaenoic acid and docosahexaenoic acid, all of which have biological properties of potential relevance for the prevention of type 1 diabetes. The main objective was to investigate whether the use of dietary cod liver oil or other vitamin D supplements, either by the mother during pregnancy or by the child during the first year of life, is associated with a lower risk of type 1 diabetes among children. Use of cod liver oil in the first year of life was associated with a significantly lower risk of type 1 diabetes. Use of other vitamin D supplements during the first year of life and maternal use of cod liver oil or other vitamin D supplements during pregnancy were not associated with type 1 diabetes. Cod liver oil may reduce the risk of type 1 diabetes, perhaps through the anti-inflammatory effects of long-chain n-3 fatty acids.

Are there any side effects of cod liver oil especially where diabetics are concerned? For instance, is it known whether or not it could affect an insulin resistant individual's blood sugar, either increasing it or lowering it, to the point the individual experienced severe muscle pain?
   We have not come across research that indicates it would have side effects in a diabetic as long as excessive amounts are not used.

Cod liver oil and rheumatoid arthritis
Here I mention two studies regarding the influence of cod liver oil supplements and rheumatoid arthritis

Effect of cod liver oil on symptoms of rheumatoid arthritis.
Adv Ther. 2002.
In this pilot study, 43 patients with rheumatoid arthritis ingested 1 gram of cod liver oil daily for 3 months. Decreases occurred in morning stiffness (52 percent), painful (42) and swollen (40) joints, and pain intensity (67). Ratings of "good" or "very good" were awarded by 68% of the patients for efficacy and by 95% for tolerability. Eleven patients reported nonsevere adverse effects that in 3 cases may have been related to the study preparation.

Supplementing with 10g of cod liver oil a day reduced the need for non-steroidal anti-inflammatory drugs (NSAIDs) by 30%, according to researchers at Dundee University, Scotland. volunteers in the study were either given cod liver oil or placebo and after 12 weeks asked to gradually reduce their use of NSAIDs, such as ibuprofen. After nine months, 40% taking cod liver oil reduced their daily dose of NSAIDs compared with 10% taking a placebo.

Sinusitis
Cod Liver oil and multivitamins in children may be helpful for chronic sinusitis.

Cod Liver Oil Research
Use of cod liver oil during the first year of life is associated with lower risk of childhood-onset type 1 diabetes: a large, population-based, case-control study.
Am J Clin Nutr. 2003.
 In Norway, cod liver oil is an important source of dietary vitamin D and the long-chain n-3 fatty acids eicosapentaenoic acid and docosahexaenoic acid, all of which have biological properties of potential relevance for the prevention of type 1 diabetes. The main objective was to investigate whether the use of dietary cod liver oil or other vitamin D supplements, either by the mother during pregnancy or by the child during the first year of life, is associated with a lower risk of type 1 diabetes among children. We designed a nationwide case-control study in Norway with 545 cases of childhood-onset type 1 diabetes and 1668 population control subjects. Families were contacted by mail, and they completed a questionnaire on the frequency of use of cod liver oil and other vitamin D supplements and other relevant factors. Use of cod liver oil in the first year of life was associated with a significantly lower risk of type 1 diabetes (adjusted odds ratio: 0.74; 95% CI: 0.56, 0.99). Use of other vitamin D supplements during the first year of life and maternal use of cod liver oil or other vitamin D supplements during pregnancy were not associated with type 1 diabetes. Cod liver oil may reduce the risk of type 1 diabetes, perhaps through the antiinflammatory effects of long-chain n-3 fatty acids.

Emails
What's the difference between fish oils and cod liver oil supplements?
   Fish oil supplements are dietary supplements that contain oil from the fat of certain cold water fish such as mackerel, anchovy, and sardines. The active ingredients in fish oil supplements are essential fatty acids known as omega-3 fatty acids. They typically include eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). These fatty acids are converted by the body into the beneficial series 3 prostaglandins. Fish liver oils, such as cod liver oil, are derived from the livers of white fish, such as cod and halibut. Cod liver oil contains vitamins A and D and has a different concentration of EPA and DHA than fish oils derived from fat. For instance, cod liver oil has a higher ratio of DHA to EPA than fish oils, which have a higher ratio of EPA to DHA. But overall, fish oils have almost 2 times as much total EPA and DHA than cod liver oil per teaspoon or capsule. To summarize, cod liver oil has the additional Vitamins A and D, a higher ratio of DHA to EPA, but almost half as much total EPA plus DHA than fish oils. Practically speaking, they are both healthy to ingest, but if you want a higher concentrated form of EPA and DHA, you would go with fish oils.

I recently read and article which condemns the use of cod liver oil because of its great oxidation effect, very much like polyunsaturated oils. Dr Ray Peat is the author. Now Dr Mercpla believes that cod liver oil is the best thing you can take. Needless to say I am totally confused. Can you please comment on this delimma.
   Only a few units of vitamin E or a small amount of antioxidants are required to protect against potential oxidation from high dose cod liver oil or fish oil. The benefits of cod liver oil or fish oil far outweigh the potential for minimal oxidation, if any, when taken with a small amount of an antioxidant or even a multivitamin.

There are a lot of myths out there on cod liver oil and where it comes from particular the toxin waters. How does one know he or she are getting a superior product when purchasing cod liver oil supplements? Are all basically the same? Is it necessary to take a vitamin D supplement if taking Cod Liver Oil?  Is there a product you would recommend over others. if so, could you give your reason why? I will be interest in hearing your opinion.
    There are a number of companies that sell cod liver oil supplements. It is not possible for the consumer to know which is the best product unless the consumer sends sample cod liver oil pills to a lab for analysis. This is not practical. Furthermore, even if one buys the cod liver oil bottles from the same company over time, each batch could be different depending on where the fish were caught. If a person is very concerned, one option is to buy the cod liver oil product from a different company each time a new bottle is needed thus not relying on one source in case that particular source happens to be inferior. As to vitamin D, each person has a different requirement depending on diet and sun exposure.