The unsaturated acids advantage for improvement of a ratio in a blood of cholesterol and other fats is accurately proved. Acids which contain in cod-liver oil are of the greatest value.
Polyunsaturated omega-3 fat acids are oxidized with ease at contact with air, action of light. To get a high-quality cod-liver oil is rather difficult. Also for prevention ahead of time oxidation in organism of fatty acids it is recommended to use them together with vitamin E. If the specified conditions are not observed, the attempt of treatment of an atherosclerosis with polyunsaturated fat acids can even by harmful.
The most important product containing unsaturated fatty omega 3acids is a cod-liver oil received from the fishes living in cold seas: mackerels, salmon, sardine. A good source is also a linseed oil.
About 5 g of cod-liver oil daily is recommended to take. It has to be packed into capsules, be stored in dark bottles, impenetrable for light. The producer has to specify the content of polyunsaturated fatty acids. Popular medicine Mega-plus Omega 3 meets all these requirements. Excessively strong smell and rancid taste evidences about expiration of preparation storage.
It is good to add to cod-liver oil a tablespoon of not rancid linseed oil received from reliable medical sources. Vitamin E should be taken in daily doses usual for the corresponding age.