Krill oil is a source of certain types of Omega 3
oils. There are different ones. Fish oil
contains two types, and flax
and hemp seed oil, for example, supply some as well. Now, I have a personal objection to krill oil, which is, krill are being killed off to get this oil and they are the food supply for most of what lives in the ocean, especially the larger creatures. Krill are tiny crustaceans and so it takes millions and millions of them to make some oil.