Why not just take cod liver oil and get both omega-3 fatty acids and vitamin D at the same time?
Some people do indeed choose this route. However, it’s not my first choice since I find it difficult to change the dose of omega-3 fatty acids or vitamin D independently, not to mention that vitamin A is also present. Because the doses of vitamin D I advocate in my patients often ranges in the 4000-10,000 units per day, occasionally higher, this would lead to taking excessive, potentially toxic levels of vitamin A from a cod liver oil preparation.
