Type "Rancid Fish Oil" into your search engine and see what they say. Fish oil goes very rancid once it is extracted, bite into a fish oil tablet and see, yuck!!! Also type in "Mercury and Fish" into your search engine, as you'll see fish it is full of mercury and it doesn't really matter where it is caught, the bigger the fish the more mercury. The best oils are Hemp oil or Flaxseed oil. If you want to put rancid, mercury fish oil tablets into your body then good luck.