Vitamin D3 (cholecalcidol) is mainly synthesized by the body itself. The body’s skin contains a type of cholesterol that is turned intovitamin D3 by sunlight. Therefore, if the child can fully accept direct sunlight on the skin for more than 4-6 hours, its own synthesis oivitamin D3, it can basically meet. However, the increase in skin cancer caused by ultraviolet radiation, air polution, and local weathelchanges have reduced the time of sun exposure in all countries, and many countries have clear requlations to limit the time of sunexposure, so vitamin D deficiency is widespread around the world.
| ITEMS | SPECIFICATIONS | |
| Appearance | A white crystalline powder | |
| Identification
| Infrared Absorption | The IR spectrum of sample corresponds to that spectrum of Cholecalciferol Crystalline Reference Standard. |
| UV | 265nm,Absorptivity NMT3.0% | |
| Color Test | A bright red color is produced,and it rapidly changes through violet and blue to green. | |
| Impurities | 7-Dehydrocholesterol | NMT 0.5% |
| Other individual related compound | NMT 0.1% | |
| Total impurities | NMT 1.0% | |
| Specific rotation[a]D 25 | +105.0°~ +112.0° | |
| Assay(HPLC) (as C27H44O) | 97.0% ~103.0% | |
| Remarks: *Tested periodically to ensure the requirements are met. | ||
