Vitamin D has two forms: D2 and D3. Vitamin D2 comes from plant-based sources. Vitamin D3 is found in some fish and produced ...

There are two types of vitamin D supplements available for over-the-counter purchase (vitamin D2 and vitamin D3 ... Wool sources of 7-dehydrocholesterol are used (from cholesterol), and ...

Researchers have shown that 50,000 International Units (IU) of vitamin D2, given weekly for eight weeks, effectively treats vitamin D deficiency. Researchers have shown that 50,000 International ...