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Overview Vitamin D3 not D2

Vitamin D2 has been known for a long time to not be as good as vitamin D3

VitaminD2 was the first to be discovered and, until 2011, was the only one that most doctors could prescribe
The D3 form has been known for many decades, but the medical profession has not yet adapted - after all, only 12,000 papers on D3 asof Oct 2023.

Several recent studies have shown that vitamin D2 actually reduces the levels of D3 in the blood
AND, worse still, D2 actually INCREASES a health problem, instead of reducing it, the way vitamin D3 does

Some multivitamins and milk/food fortifications still use D2, but in such low quantities that it can be ignored.
Some people buy D2 because it is vegan, being unaware that there are vegan forms of D3

All items in D3 vs D2 104 items

Far better response to D3 than D2

Response to 20,000 IU vitamin D3 extra per week
Most > 20ng and some > 40ng

Response to 20,000 IU of vitamin D2 per week (im = inter-muscular injection)


Very few got to 40ng


The 2006 study can be read at Vitamin D2 should not be used as a Vitamin supplement for any mammal – Oct 2006

D2 decreases D3 (50,000 IU D2 every 14 days) - June 2012

 Download the PDF from Vitamin D Life

Irradiated mushrooms decreased Vitamin D3 levels by 40% - Nov 2020

Assessing the impact of a mushroom-derived food ingredient on vitamin D levels in healthy volunteers
1000 IU D2 daily from irradiated Mushrooms for 12 weeks
 Download the PDF from Vitamin D Life

11+ Vitamin D Life pages with MUSHROOM(S) in the title

This list is automatcially updated

Items found: 11

See also Vitamin D Life

See also web

here are some images of D2 to stay away from


See also PDFs at the bottom of this page

Changes in circulating 25-hydroxyvitamin d according to vitamin D binding protein genotypes after vitamin D3 or D2 supplementation April 2013
   Yet again: D2 reduces the levels of D3 in the blood. Also, D2 does not turn on genes.

Vitamin D2 Supplementation Amplifies Eccentric Exercise-Induced Muscle Damage in NASCAR Pit Crew Athletes: Jan 2014
   Vitamin D2 made muscle damage WORSE. 3,800 IU D2 from Portobello mushroom powder
  Vitamin D Council post on this item

short url for the page = http://is.gd/vitd3d2

Overview Vitamin D3 not D2        
71367 visitors, last modified 22 Oct, 2023,
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Attached files

ID Name Comment Uploaded Size Downloads
17437 D3 not D2 2006.pdf admin 16 Apr, 2022 86.57 Kb 377
14557 irradiated mushrooms lowered D3 levels RCT.pdf admin 11 Nov, 2020 673.66 Kb 811
8988 D2 decreases D3.jpg admin 22 Dec, 2017 18.01 Kb 5028
8987 D2 long term effectivness of infrequent.pdf admin 22 Dec, 2017 488.04 Kb 1555
4378 D2 vs D3 -3.jpg admin 17 Sep, 2014 67.81 Kb 25098
4377 D2 vs D3 -2.jpg admin 17 Sep, 2014 52.94 Kb 13693
4376 D2 vs D3 -1.jpg admin 17 Sep, 2014 52.53 Kb 16591
3416 D2 muscle.pdf admin 20 Dec, 2013 245.27 Kb 2319
2300 D3 better than D2 yet again.pdf admin 05 Apr, 2013 170.73 Kb 2851
925 D2 pill C.jpg admin 07 Dec, 2011 3.61 Kb 12025
924 D2 pill B.jpg admin 07 Dec, 2011 3.85 Kb 11842
923 D2 pill A.jpg admin 07 Dec, 2011 5.60 Kb 11860