Not too sure about nutrition comparison, but I remember my vet telling me to avoid anything with cod liver oil because it will make our bullies smell like fish. I'm guessing it'll come out of their pores. I give Stiggy wild alaskan salmon oil gel pills, which I bought from Costco. At first, I used to pierce a small hole so that he's able to smell it first before eating so it entices him more. But now he'll take it as it is. I used to religiously give him 1 in the morning and 1 at night. But now, it's whenever I remember.