People have historically taken cod liver oil to help alleviate symptoms of many different conditions and diseases.
Cod liver oil contains some omega 3 fatty acids. These have been shown to help maintain stable blood sugar in the body. They can help enhance the absorption of vitamins and minerals from food. Omega 3 fatty acids also have a protective immune system function and help promote the feeling of being satiated after eating a meal. They are a beneficial fat to include in the diet.
The vitamins prevalent in cod liver oil are vitamins A and D which are both fat soluble hence they are found in fish oil.
Vitamin A also known as beta carotene is excellent for night vision. Vitamin D is excellent for bone development and helps to regulate the levels of calcium and phosphorus that are deposited into bones. Vitamin D supports the function of the immune system against many diseases including cancer. It supports maintenance of stable sugar levels in the blood and helps the respiratory and nervous systems. It helps to lower cholesterol and blood pressure in patients with heart disease. It has a beneficial effect on people suffering from arthritis.
Cod liver oil has a very high amount of these two vitamins so it is an excellent source of these vital nutrients.
I have attached a link with nutritional data for 1 cup of cod liver oil to show its high amounts of vitamins A and D.