Origin	China
CAS No.	67-97-0
Purity	97-103%

Vitamin D is a group of fat-soluble prohormones, the two major forms of which are vitamin D2 (or ergocalciferol) and vitamin D3 (or cholecalciferol).[1] The term vitamin D also refers to metabolites and other analogues of these substances. Vitamin D3 is produced in skin exposed to sunlight, specifically ultraviolet B radiation.

Vitamin D plays an important role in the maintenance of organ systems.[2]

Vitamin D regulates the calcium and phosphorus levels in the blood by promoting their absorption from food in the intestines, and by promoting re-absorption of calcium in the kidneys.
It promotes bone formation and mineralization and is essential in the development of an intact and strong skeleton.
It inhibits parathyroid hormone secretion from the parathyroid gland.
Vitamin D affects the immune system by promoting immunosuppression, phagocytosis, and anti-tumor activity.
Vitamin D deficiency can result from inadequate intake coupled with inadequate sunlight exposure, disorders that limit its absorption, conditions that impair conversion of vitamin D into active metabolites, such as liver or kidney disorders, or, rarely, by a number of hereditary disorders.[2] Deficiency results in impaired bone mineralization, and leads to bone softening diseases, rickets in children and osteomalacia in adults, and possibly contributes to osteoporosis. Vitamin D deficiency may also be linked to many forms of cancer.

Appearance		White crystalline powder	White crystalline powder
Solubility		Soluble in ethanol, acetone, chloroform or aether. Slightly soluble in vegetable oil. Insoluble in water	Corresponding
Identification		Infrared absorption spectrophotometry, Comparison: cholecalciferol CRS	Corresponding
Melting Point		82°C-87°C	83.7°C
Pre-cholecalciferol		0.05%max	Corresponding
Trans-cholecalciferol		0.1%max	Corresponding
Light absorption		465-495	486
Specific optical rotation		+105° - +112°	+110.6°
Organic Volatile Impurities	Methanol	Max.3,000 ppm	Not detected
	Hexane	Max. 290ppm	Not detected
	chlorobenzene	Max.360ppm	Not detected
Assay		97.0-103.0% 38,800,000-41,200,000IU/G	99.4% 39,760,000IU/G
Conclusion The batch tested complies with BP2003, Ph. Eur 6.0 and USP30