Vitamin D2 (Ergocalciferol)

Overview:

Vitamin D2, or ergocalciferol, is a form of vitamin D derived from plant sources and fungi. It is often used in supplements and fortified foods to help prevent or treat vitamin D deficiencies.

Sources:

Vitamin D2 can be found in fortified foods and is available as a supplement. It is derived from plant sources like mushrooms exposed to ultraviolet light.

Functions:

Bone Health: Like vitamin D3, vitamin D2 helps in the absorption of calcium and phosphorus, promoting bone health and preventing rickets and osteomalacia.

Immune Function: It supports the immune system by enhancing pathogen-fighting effects of monocytes and macrophages.

Deficiency:

A lack of vitamin D2 can lead to symptoms similar to those of a general vitamin D deficiency, such as bone pain, muscle weakness, and an increased risk of fractures.

Toxicity:

Excessive intake of vitamin D2 supplements can lead to hypercalcemia, with symptoms including nausea, vomiting, kidney stones, and in severe cases, calcification of soft tissues. The tolerable upper intake level for adults is 4,000 IU per day.