As I understand it a high amount of Omega-6 means that you cannot absorb the omega-3. From WP:
> Thus accumulation of long-chain n−3 fatty acids in tissues is more effective when they are obtained directly from food or when competing amounts of n−6 analogs do not greatly exceed the amounts of n−3.
Fish oil contains a higher ratio of omega-3 to omega 6 than other sources (flax seed).
Also, fish oil contains Vitamin D which is very good for teeth (if you get enough vitamin D, holes in teeth repair themselves).
A lot of fish oil is also specified as "cod liver oil". So I don't think that it uses the above fish and i don't think that the cod livers is used in food (so it is a byproduct).
> if you get enough vitamin D, holes in teeth repair themselves
I'm interested - do you have a citation for that? I've read that teeth can repair themselves to some extent in Weston A. Price's Nutrition and Physical Degeneration.
> Thus accumulation of long-chain n−3 fatty acids in tissues is more effective when they are obtained directly from food or when competing amounts of n−6 analogs do not greatly exceed the amounts of n−3.
Fish oil contains a higher ratio of omega-3 to omega 6 than other sources (flax seed).
Also, fish oil contains Vitamin D which is very good for teeth (if you get enough vitamin D, holes in teeth repair themselves).
A lot of fish oil is also specified as "cod liver oil". So I don't think that it uses the above fish and i don't think that the cod livers is used in food (so it is a byproduct).