Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 67-97-0, Whether you call it Cholecalciferol, Activated 7-Dehydrocholesterol , Colecalciferol , Vitamin D or Vitamin D3 you can be assured the Cholecalciferol products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.