and vitamin D3 (cholecalciferol) — and the difference between them is in their chemical structure and the way they’re made, research notes. Vitamin D3 is the form of vitamin D that the body ...

Vitamin D2 and D3 are types of vitamin D that help maintain or raise vitamin D levels in the blood and treat deficiencies. They have slightly different chemical structures and come from different ...

vitamin D, was unambiguously identified in the 1930s, thanks to the work of researchers studying the chemical structures of members of the cholesterol family.