Vitamin D2, also known as ergocalciferol, is a type of vitamin D that is primarily obtained from yeast and fungi. It plays a crucial role in maintaining healthy bones by helping the body absorb calcium. Unlike Vitamin D3, which is produced in the skin through sunlight exposure, D2 is often found in fortified foods and supplements. When consumed, Vitamin D2 is converted into an active form in the liver and kidneys, which then helps regulate calcium and phosphate levels in the body. Adequate levels of this vitamin are essential for overall health, particularly for the immune system and muscle function.