The canonical advice with vitamins is always that it's best to get them in food, as part of a healthy diet. The interesting thing here perhaps is that if you l

The canonical advice with vitamins is always that it's best to get them in food, as part of a healthy diet. The interesting thing here perhaps is that if you live above 37 degrees latitude, there are very few ways to get vitamin D, mainly fish and fortified foods. Fortified foods are arguably not that different from supplements, and fish is pricey, unpopular, and somewhat of a specialty food. So, perhaps there really is an argument for vitamin D supplementation. Although, at least for its cofactors, I'll be trying to get them from food.