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Cod liver oil is among the most useful health supplements — it contains very high levels of vitamin A and vitamin D, and in addition, is very high in omega 3 fatty acids, which have a wide range of health benefits. The list of benefits obtained from omega 3 fatty acids is almost too long to go into — they improve blood circulation, help control blood pressure, and reduce the risk of heart disease and stroke...

Since you have already taken your son to a hospital and they have not found out the cause of his persistent cough, I would suggest that you visit a specialist as well as an ENT specific hospital. A cough is not a disease in itself but is actually a symptom...