Hello,  over time we have shared studies and discussion on Vitamin D.  Here are some bullet points to recap followed by a few new discussion points presented by Dr. Jie

+ Vitamin D is plentiful in the sea.  Vitamin D originates at the base of the food chain as both D2 and D3 in zoo and phyto plankton.  Discussion located in blog posted January 2014 titled Food Chain as Origin of Vitamin D in Fish

+ man made vitamin D2 is toxic to humans as I think we might discover all man made vitamins are toxic to us in the long run. Some more than others.

+As commonly known within the fishery industry and referenced to Fishery By-Products Technology "Fish oil, especially cod liver oil, is the best natural source of vitamin D2"

+When we test our fermented cod liver oil there are a variety of peaks within the graphs that excite the technicians not only the D2/D3 peaks.

+We  routinely test our fclo for D2/D3 but we also went through the expense to have our oils tested using the rat bio assay.   The lab fed our fclo to rats and measured bone growth/density to confirm not only are there molecules floating around but they are active in fuction.  Our products were very active with vitamin D affect.   The scientist who did the work taught me much on the subject.   One paraphrase I will not forget;  'All the vitamin D testing is meaningless.  The only way to test vitamin D is to feed it to rats!  Rats don't lie! '  In other words... count all the molecules you want.  Counting molecules does not equate to results.

+Plus thousands upon thousands of customers who can attribute rapid bone healing, calcification corrections, facial development, dental development etc,,,,,  thank you all for your contributions to the discussion

+I tested Atlantic Cod livers (specific speceis from this part of the world)  tested three products:  As rendered Atlantic Cod Liver Oil,  Canned Atlantic Cod Livers (using the oil in can only) and i brought in some wild caught Atlantic Cod Livers and fermented them.  All three lots had plenty of vitamin D2.  Very little Atlantic Cod is caught in the world.  This species has been decimated by over fishing.  There are still a couple fisheries open for this species but most of the world does not fish this species today.  I think a majority of the Atlantic Cod bought in stores is farmed.   I do not know this definetly but based on conversations with people in the industry I think this is the case.

 

Below is short discussion provided by Dr. Jie on Vitamin D2 vs D3.  He is working on a couple papers of interest to the group and this discussion will be part of his work but in much more detail.  

 

Hi Dave,

I just quickly searched some scientific papers and found something interesting. The argument of "Vitamin D3 is better than Vitamin D2," is really meaningless. If they have different function, or if Vitamin D2 has not bio-activities, how can it be given a name as Vitamin D?

Here is something from USDA:

Major metabolic steps involved with the metabolism D2 are similar to those of the metabolism of D3. Vitamin D without a subscript represents either D2 or D3 or both and is biologically inert, requiring two obligate hydroxylations to form its biologically active hormone, 1,25-dihydroxyvitamin D (1,25(OH)2D) (DeLuca, 1988; Reichel et al., 1989).

http://www.nal.usda.gov/fnic/DRI/DRI_Calcium/250-287.pdf

Since both Vitamin D will be converted into same bio-active hormone in your body, why we are still struggling with the form of them?

Okay, here is more:  A research conducted by Dr. Michael F. Holick said,
Vitamin D2 Is as Effective as Vitamin D3 in Maintaining Circulating Concentrations of 25-Hydroxyvitamin D
(the abstract can be found in NIH database: http://www.ncbi.nlm.nih.gov/pubmed/18089691 and the fulltext can be accessed through http://press.endocrine.org/doi/abs/10.1210/jc.2007-2308)

I think people would like to concentrate on Vitamin D3 is due to it can be synthesized in the skin. But remember, the bio-active hormone is 1,25-dihydroxyvitamin D, which comes from both Vitamin D2 and D3.


Bests,

Jie
D3 & D2D2 & D3