What is a common dietary source of vitamin D?

Vitamin D is a fat-soluble vitamin that plays a crucial role in maintaining bone health and overall physiological function. One of the most common dietary sources of vitamin D is fish liver oil, which is particularly rich in this vitamin. Fatty fish (such as salmon, mackerel, and sardines) and products derived from fish liver oil provide substantial amounts of vitamin D, making them highly effective sources for those looking to enhance their vitamin D intake.

While leafy greens and whole grains are important components of a balanced diet, they are not significant sources of vitamin D. Similarly, egg whites contain minimal amounts of vitamin D; most of the vitamin D present in eggs is found in the yolk. Therefore, fish liver oil stands out as the most reliable dietary source of vitamin D among the options listed.