Vitamin D3

Product name : Vitamin D3

CAS : 67-97-0

Molecular formula : C₂₇H₄₄O

Molecular Weight : 384.64

Product description :
Vitamin D3 is made in the skin when 7-dehydrocholesterol reacts with ultraviolet light (UVB) at wavelengths between 270 and 300 nm, with peak synthesis occurring between 295 and 297 nm. These wavelengths are present in sunlight when the UV index is greater than three and also in the light emitted by the UV lamps in tanning beds. Tanning lamps produce ultraviolet primarily in the UVA spectrum, but typically produce 4% to 10% of the total UV emissions as UVB. At this solar elevation, which occurs daily within the tropics, daily during the spring and summer seasons in temperate regions, and almost never within the arctic circles, vitamin D3 can be made in the skin.