Ergocalciferol

Ergocalciferol (also known as vitamin D₂) is a type of vitamin D. It is found in fungi (like mushrooms and yeast). It can be found plant-based milks, orange juice, and cereals. It is also cheaper than vitamin D₃ to produce. It is absorbed by small intestine and transported to the liver and converts to 25-hydroxyvitamin D₂. Then, it is moved to the kidneys in order to convert to calcitriol.

References

This short article about chemistry can be made longer. You can help Wikipedia by adding to it.