I try to take a tablespoon of cod liver oil regularly.
I keep a bottle in the fridge. I pour it in to a spoon and take it straight. Most people can't stand the flavor, and need to hide it in a drink, or take it in capsule form. I don't like the taste, but it doesn't bother me much.
I worry most about the capsule form. Capsules are medicine-like, and I know that both capsules of code liver oil and medicines are the result of a massive industry, which does a lot of harm. I think of Merck's effective lobbying campaigns. Also, the capsules are pretty expensive, so you end up sending lots of money to the makers, encouraging them to make more. Still, I know that it can be tough for people who don't like the taste of the straight stuff to get the nutrition their bodies need.
Speaking of which, what is the nutrition that I'm looking for? Mostly, it's vitamin A. From what I've read, the vitamin A in cod liver oil is very dense, and relatively easy to assimilate. Weston Price found that the ability to use this vitamin depended on the "Price Factor" in carefully prepared dairy, so I try to take it near the use of butter at breakfast.
I recommend daily cod liver oil for people who plan on making a baby in the next 6 months, and for pregnant and nursing women. It's great for the baby. (Yes, even dad's nutrition before making the baby matters a lot.)