2. Cod liver oil
It might not sound too appealing, but cod liver oil is an excellent source of vitamin D. In fact, a single teaspoon contains around 450 IU of vitamin, which is about 75 percent of the recommended daily intake. If you aren’t fond of the flavor, you can try mixing the oil in with a smoothie, or you can simply take a supplement.
However you take it, if you want to increase your vitamin D levels, you should certainly consider taking cod liver oil a regular part of your diet. In addition to containing a high level of vitamin D, you will also get a lot of other vital nutrients when you take cod liver oil. The oil of this fatty fish contains vitamin A, monounsaturated fatty acids, omega-3 fatty acids, and polyunsaturated fats. As a result of all of these nutrients, cod liver oil can be highly beneficial.