Cod Liver Oil
Cod liver oil is the one your grandparents probably took, and it has quietly stuck around because it makes sense: omega-3 plus naturally occurring vitamins A and D in one spoonful or capsule. It overlaps with plain fish oil but brings those extra vitamins, which is a plus in winter. One thing to watch is the vitamin A, since it is easy to double up if you take other A-containing supplements.
Common questions
Cod liver oil or regular fish oil?
Fish oil is usually higher in the omega-3s (EPA and DHA); cod liver oil adds vitamins A and D. If you mainly want omega-3, standard fish oil often delivers more; if you like the vitamin top-up, cod liver oil is the traditional pick.
Can I take it with a multivitamin?
Watch the vitamin A. Cod liver oil contains it, and stacking several A sources can add up. Check the totals if you take a multi as well.