People see the word "vitamin" and think it's a food like vitamin C. But Vitamin D isn't like that, there's not many foods that are high in vitamin D and most th

People see the word "vitamin" and think it's a food like vitamin C. But Vitamin D isn't like that, there's not many foods that are high in vitamin D and most that are are fortified. If we could get sufficient vitamin D from food then we wouldn't have evolved a mechanism to get it from the sun. Vitamin D also accumulates, which is a feature if you are getting it from sunlight but a potential problem if you are taking supplements.