9. Cod liver oil
Cod liver oil is a great source of vitamin A. As we are commenting it is one of the main nutrients that will help you keep the mucosal lining in a healthy state.
In addition this type of oil is a great source of omega-3. It is best to take this type of oil through capsules, as they are one of the main options we find on the market in this regard. You can also take 1 tablespoon of this oil to relieve your stomach pain.