Vitamin D2, also known as ergocalciferol, is achromatous acicular crystal or white crystalline powder. It is scentless and flavorless, easier to metamorphose when meets with light and air. VD2 is wondrously easy to dissolve in the chloroform， easy to dissolve in the ethanol, acetone,or aether, appreciably dissolved in the vegetal oil, and not be dissolved in the water. Meanwhile VD2 has a good ability to endure heat and the melting range is 115~118 centigrade.

    VD2 participates in the metabolism of the calcium and phosphorus of the body. And it can accelerate the absorption of the calcium and phosphorus in the intestines, facilitate the bone mineralization, increase the chroma of the calcemia and the hemo phosphorus.VD2 can prevent and cure rachitis, bone softening. Especially for hypogenesis of the infant, the calcium’s lack of the women in the period of the pregnancy, and the osteoporosis of the old, VD2 plays a better effect. Also it can be used as nutrition and feed additive. In addition, VD2 may have anti-osteoporotic, immunomodulatory, anticarcinogenic, antipsoriatic, antioxidant and mood-modulatory activities.