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Below is a thread from one of the yahoo groups i belong. i thought the tread is worth a posting on my blog. It starts off with someone questioning testing blood for vitamin D levels:
"At the 2009 Wise Traditions Conference Dr. Louisa Williams stated that Vitamin D testing only tells you what is circulating in the blood NOT what is actually getting into the tissues where it makes a difference.
I think the whole vitamin D testing frenzy is just that; another way for someone to make a buck off the consumers."
"Maybe entry into the cells has something to do with my low levels - 22 ng/dl this summer.
I know Dr. Levy says that is an issue with vitamin C, how easily it can get into the cells. Perhaps my low levels according to my tests are because the Vitamin D is working away within the cells, rather than just running around in the blood stead???. "
my comment...
"I agree, we do not have a full understanding of what we doing when testing for vitamin D in either a product or in the blood. Nor do i think we understand what the readings mean in relation to how it translates to human health/ for use and effectiveness. This hormone is way more complex than the media medicine is describing.
I have heard from many doctors with concerns such as... readings are all over the place,different from one lab to another, we don't know what the readings mean in relation to health, we don't understand the variety of metabolites, we don't know what is ideal amount of vitamin D, people are different and we need to treat them as inpiduals including with supplementing with any molecule including a vitamin D isolate.
I became comfortable with vitamin D discussion in the FCLO when we worked with the last remaining lab doing rat bio assay. Until we worked with this lab I was was concerned with all the variability and was scrambling, shot gun like, on how to get consistent interpretation of the various peaks. After the rat bio assay, my conclusion was it does not matter what this lab or that lab thinks/tests. It is what it is and it is a real food not a drug.
FCLO has had a historical track record as being naturally high in vitamin D and one of the only natural sources relied upon for high levels of vitamin D. This long rich history is true, without the aid of any lab. there are a variety of different metabolites, not just one molecule, such as D3. Rat bio assay measures actual vitamin D availability/usability. The rat bio assay scientist says all the vitamin D testing is bunk.... the only way to test vitamin D is with Rats, rats don't lie.
A rat bio assay does not give measurements like a HPLC but does show effectiveness of vitamin D. the FCLO was very active with the rats. it took the lab several months and 3 trials to get a handle on the vitamin D as the level was much more intense than the lab was expecting. They were over saturating the rats and could not reach the top notes.
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