Fish oil has a long and colorful history and it has been around since the time the single celled organisms mutated to multiple celled organisms. It is only recently that fish oil became popular due to the presence of Omega fatty acids in the oil and these can be used to cure many diseases as well as keep the person who is taking it healthy. Cod liver oil is a popular source of nutrients and supplements for children and similarly fish oil has become popular as one of the variants that can be used on children particularly when they are in the growing years. The variants of fish oil include cod liver oil and other compounds that were produced in England during the time of the Industrial revolution. However, due to the pollution of the rivers because of effluents from industries, the cod started to wither away and die. This led to a temporary halt to the use of cod liver oil.