from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See vitamin D2.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Constituent of vitamin D1 and vitamin D2.
from the GNU version of the Collaborative International Dictionary of English
- n. vitamin D2, one of the D vitamins, a group of related substances that prevent rickets.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a fat-soluble vitamin that prevents rickets
Also has to be D3 (cholecalciferol, not D2 ergocalciferol) and oil based (softgels, not tablets).
Drisdol is a prescription of 50,000 IU tablets of vitamin D2 or ergocalciferol.
He also recommends taking vitamin D3 (cholecalciferol), not vitamin D2 (ergocalciferol), its synthetic analog.
There are two important forms of vitamin D to note: ergocalciferol (vitamin D2) and cholecalciferol (vitamin D3).
Cholecalciferol, or Vitamin D3, is a form of Vitamin D that is more easily absorbed and used by the body than the inferior ergocalciferol, which also goes by the name of Vitamin D2.
Vitamin D refers to two biologically inactive precursors - D3, also known as cholecalciferol, and D2, also known as ergocalciferol.
The injectable form of ergocalciferol (300 000 IU) was the only high dose vitamin D product available, and then only sporadically.
The only licensed oral, high dose vitamin D supplements (ergocalciferol tablets 10 000 IU and 50 000 IU) were discontinued by UCB Pharma in May 2009.
The two forms of vitamin D used in dietary supplements are ergocalciferol (vitamin D2) and cholecalciferol (vitamin D3).
When ultraviolet light from the sun hits the leaf of a plant, ergosterol is converted into ergocalciferol, or vitamin D2.