There is a lot you can say and there is a lot that has been written about the ratio of omega 3 to 6, and of the lack of omega 3 in most diets. The ratio is important because these essential oils share the same enzyme pool. It is postulated that we likely evolved on a straight 1:1 ratio. Maybe in the days when the sea was booming with fish and so were the rivers, we just ate plenty of it. Or it could be conversley that we did not have the omega 6 overload that we now have to tip the balance.
Add to this, that other forms of omega 3 found in nuts and seeds do not convert enough for the desired effect.