fish oil

Sources of fish oil: Fish oil can be obtained from eating fish or by taking supplements. Two of the most important omega-3 fatty acids contained in fish oil are eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA).
While we can produce EPA and DHA from a fatty acid known as ALA our bodies have a very limited capacity to synthesize these omega-3s. This is why fish oil is recommended.
Fishes that are especially rich in the beneficial oils known as omega-3 fatty acids include mackerel, herring, tuna, salmon, cod liver, whale blubber, and seal blubber.
Benefits of Fish Oil:
Fish oil is FDA approved to lower triglycerides levels, but it is also used for many other conditions. It is most often used for conditions related to the heart and blood system.
Some people use fish oil to lower blood pressure, triglycerides and cholesterol levels. Fish oil has also been used for preventing heart disease or stroke, EHA and DHA accumulate in the area of brain associated with learning ability, concentration and  cognitive skills.
Some people use fish oil for dry eyes, cataracts, glaucoma and age-related macular degeneration (AMD), a common condition in older people that can lead to vision changes.
Women take fish oil to prevent painful periods, breast pain and complications associated with pregnancy .
Fish oil is taken by mouth for weight loss, exercise performance and muscle strength, muscle soreness after exercise, pneumonia, cancer and lung disease
Fish oil is also used for diabetes, prediabetes, asthma, a movement and coordination disorder called dyspraxia, dyslexia, eczema, autism, obesity, weak bones (osteoporosis), rheumatoid arthritis (RA), osteoarthritis, psoriasis, an autoimmune disease called systemic lupus erythematosus (SLE), multiple sclerosis.
Fish oil is used intravenously (by IV) for scaly and itchy skin (psoriasis), blood infection, cystic fibrosis, pressure ulcers, and rheumatoid arthritis (RA). Fish oil is applied to the skin for psoriasis.
Cod Liver Oil
The medical use of cod liver goes back centuries. Its first documented medical use was in 1789, when Dr Darbey of the Manchester Infirmary in England used the oil to treat rheumatism.
Only a few decades later, in 1824, cod liver oil was used as a remedy against rickets. By the 1930s the therapeutic properties of cod-liver oil were well established and it was frequently given to children to help prevent rickets and other conditions caused by vitamin D deficiency.
The difference between cod liver oil and regular fish oils is that fish oils are extracted from the tissue of deep sea oily fish such as tuna, trout, mackerel, herring, salmon and Cod liver oil is exclusively derived from liver of cod fish (Gadidae). As with most fish oils, it has high levels of the omega-3fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Cod liver oil also contains vitamin A and vitamin D. It is historically been taken because of its vitamin A and vitamin D content. It was commonly given to children because vitamin D has been shown to prevent rickets and other symptoms of vitamin D deficiency.
Some people take Cod liver oil in winter as they spend less time outdoor and they switch off to Fish oil in summer.
A quick review of fish oils by a researcher with Aurobindo Pharma, based on limited information available on the packs of each of these products:
Seacod Cod liver oil
Seacod is one of the oldest cod liver oil products from a reputed brand Sanofi and has been acclaimed to be a good source of nutrients.

Sevenseas cod liver oil:
This is an advanced manufacturing process that ensures purest cod liver oil that goes into each capsule.
This is a good blend of Cod Liver Oil with naturally sourced Omega-3 provides a rich source of Omega-3 nutrients (EPA & DHA) as well as essential Vitamins D & E - helping to support everyday good health.
Seven Seas Cod Liver Oil Extra High Strength offers a wide range of benefits, including maintenance of normal blood pressure. The beneficial effect for blood pressure is obtained with a daily intake of 3 g EPA and DHA. EPA & DHA contribute to the maintenance of normal heart function.
The beneficial effect for heart function is obtained with a daily intake of 250 mg EPA and DHA. Vitamin D contributes to the maintenance of normal bones and muscle function and contributes to the normal function of the immune system.
Nature Bounty fish oil: (currently not available on WellForte)
Natures bounty fish oil contains a high concentration of 70% Omega-3 fatty acids, providing 980 mg from 1400 mg of fish oil. While regular strength fish oils typically contain 300 mg of Omega-3s from 1000 mg of fish oil, this Nature’s bounty fish oil  undergoes additional purification steps to concentrate these essential fats while removing unwanted compounds and toxins such as dioxins, mercury etc.
Adverse effects:
Vitamin A accumulates in the liver, and can reach harmful levels sufficient to cause hypervitaminosis A.
Pregnant women should consult a doctor when taking cod liver oil because of the high amount of natural forms of vitamin A such as retinol.
A toxic dose of retinol (vitamin A) is around 25 000 IU/kg), or the equivalent of about 1.25 kg of cod liver oil for a 50-kg person.
The risks of fatty acid oxidation, hypervitaminosis, and exposure to environmental toxins are reduced when purification processes are applied to produce refined fish oil products.