Vegetarian source of vitamin B12

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Health through Nutrition

Practical Health

Further to the earlier post:

Vitamin B12, Drinking Water Fluoridation, and Alzheimer's Dementia (AD)

The following should be useful to the vegetarian readers. More on B12 will be posted shortly.

Chris Gupta

Feeding nori (dried purple layer, a commonly consumed seaweed) to vitamin B12-deficient rats significantly improved vitamin B12 status, as demonstrated by the elimination of methylmalonic acid from the urine and by a significant increase in hepatic vitamin B12 concentrations (especially adenosylcobalamin). The amount of total vitamin B12 in nori, determined by 1) Lactobacillus bioassay and 2) chemiluminescent assay with hog intrinsic factor, was estimated to be 55 and 59 mcg/100 g dry weight, respectively. Five different biologically active vitamin B12 compounds were identified in nori (cyanocobalamin, hydroxocobalamin, sulfitocobalamin, adenosylcobalamin and methylcobalamin).

Comment: Vegetarians are at risk of developing vitamin B12 deficiency, as this vitamin is present almost exclusively in animal products. Several different seaweeds have been claimed to contain vitamin B12. The research in this area is conflicting, however, and many of the studies purporting to show vitamin B12 activity did not distinguish between true vitamin B12 and biologically inactive vitamin B12 analogues. The present study provides strong evidence that nori does, indeed, contain bioavailable forms of vitamin B12.

Townsend Letter for Doctors and Patients, May 2003 p32(1)
Vegetarian source of vitamin B12. (Literature Review & Commentary). (Brief Article) Alan R. Gaby.

Full Text: COPYRIGHT 2003 The Townsend Letter Group

 

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posted by Chris Gupta on Sunday February 22 2004
updated on Saturday September 24 2005

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Readers' Comments

Yes, if you are a rat or sea creature. In my 2-year observation of 23 vegetarians eating nori, all of them continued to have symptoms of B12 deficiency, mainly anemia, depression and/or ADD, ADHD.
aajonus

Posted by: aajonus on February 25, 2004 04:39 AM

 

I wonder what, role if any, does msg and aspertame play on bio-availability or synthesis of B12?

Posted by: Michael Roberts on March 20, 2007 02:48 PM

 

I wonder what, role if any, does msg and aspertame play on bio-availability or synthesis of B12?

Posted by: Nature is Best on August 19, 2007 02:12 PM

 

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