Eggs are a solid source of vitamin D, but many foods like cod liver oil, rainbow trout, and fortified milk contain higher levels of this important nutrient.

Learn which of the best omega-3 supplements are recommended by nutrition experts for women, men, kids, and more.

There are many stories of mothers forcing their children to take cod liver oil. Centuries ago, northern Europeans used cod liver oil to protect them from the cold. It was made from the livers of Gadus ...