Where does the vast majority of the world’s fish oil come from?

The vast majority of the world’s fish oil comes from South America and North Africa, but because the oil is later refined in Norway, it is often branded as Norwegian, regardless of the oil’s origin.  That is why 

regular fish oils typically taste and smell bad and often produce ‘fish oil burps’. Since the main goal of the industry is to produce fishmeal, the manufacturers have little interest in maintaining the quality of the fish oil. The oil is usually extracted last and often goes rancid within a short period of time. New techniques enable manufacturers to make the oil taste less offensive.

However, you can never restore a rancid fish oil back to freshness.

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