• Vitamin D2 actually decreased vitamin D3 levels – RCT Nov 2012

  • Vitamin D3 increased and Vitamin D2 decreased the D3 serum levels – RCT Sept 2013

  • Vitamin D2 decreased blood levels of Vitamin D3 by 12 ng – RCT July 2012

  • Vitamin D3 is much better than D2, especially if not taken daily – meta-analysis June 2012

  • MS worse with Vitamin D2 – Oct 2011 high dose of D2 resulted in worse MS than low dose

  • Chance of a fall decreased with vitamin D3 but increased with D2 – Oct 2011

  • 10 million IU of vitamin D3 for cows was great unless had vitamin D2 – July 2011

  • Hemodialysis not helped by weekly vitamin D2 – RCT April 2015

  • Following large doses of vitamin D2, Vitamin D3 doses were unable to achieve sufficiency – Jan 2014

  • Vitamin D2 decreased vitamin D3 levels in the blood – Feb 2011

  • Vitamin D2 loading doses did not increase, and may have decreased blood levels– June 2011

  • Vitamin D3 for Vegans – Oct 2011 lichen, etc.

  • Primates Nutrient Requirements – 2003 ALL primates need D3, not D2

  • Vitamin D3 but not D2 reduces mortality – Cochrane meta-analysis July 2011

  • 6% relative risk REDUCTION of mortality when supplementing with vitamin D3

  • 2% relative risk INCREASE of mortality when supplementing with vitamin D2

  • Vitamin D2 reduced the Vitamin D3 by half – Feb 2012

  • Vitamin D from mushroom or supplements decreased vitamin D3 in the body – June 2012

  • Vitamin D3 much better than D2 for loading doses– meta-analysis May 2012

  • Not much difference between D3 and D2 for daily doses?

  • Vitamin D2 did not help Lupus (no surprise, D2 was given weekly) – June 2013

  • Cooked mushrooms (Vitamin D2) did not increase vitamin D serum levels – Aug 2014

  • Vitamin D3 far better than D2 at raising infant vitamin D blood levels – Dec 2012

  • Vets no longer use D2 for mammals due to adverse affects

Beef liver, cheese, egg yolks and fatty fish, which contain small amounts of D3, are the best dietary sources of D3. Cod liver oil provide a time-honored potent source of D3, although the taste might be a turnoff. Fortified milk and orange juice also contain vitamin D; manufacturers can choose to add either either D2 or D3. Mushrooms supply D2 to your diet.