Hi Hank, I understand sometimes we have to make sacrifices for our health. I always look for alternate ways. If I have a choice I prefer not using any animal sources, especially seals. I cannot justify taking a supplement purely on chance I.e. without any medical evidence. I do believe there is a difference between the two. It is the seals that are the mammals. Their quantity is greatly outnumbered by salmon or fish which is farmed. Besides the fish oil, I eat walnuts and flax seeds. A vegetarian diet can be a very healthy diet. Fantastic! I believe it can help in many health issues.