I read that too, and it explains why it is not a good idea to take cod liver 
oil for your D3 as the A will block its uptake.  dee

On 15 Nov 2009, at 01:43, Jonathan B. Britten wrote:

> I watched an interesting video from UCSD that a member posted here.   It 
> included a warning that D3 and Vit. A block the effects of one another, 
> mainly A blocking D3.   I recommend the video -- one of the most valuable 
> postings on this list in quite some time.
> 
> 
> 
> 
> 
> On Sunday, Nov 15, 2009, at 03:29 Asia/Tokyo, sol wrote:
> 


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