April 30, 2026 Vitamin D Vitamin D is a fat-soluble vitamin that is naturally present in some foods and added as a supplement to others. The highest level of vitamin D is found in fatty fish such as salmon, tuna, trout, and mackerel. Lesser amounts are present in egg yolks and cheese. Vitamin D-fortified foods include dairy products and cereals (Srivastava, 2021). Vitamin D may also be obtained indirectly from sun exposure. This occurs when the skin absorbs ultraviolet B rad