anyone know of any current studies on this?

Vitamin B12 synthesis by human small intestinal bacteria

[www.nature.com]


also some interesting info in the wiki

folate masks b12 defic, plus other good stuff in the wiki

The total amount of vitamin B12 stored in body is about 2–5 mg in adults. Around 50% of this is stored in the liver.[18] Approximately 0.1% of this is lost per day by secretions into the gut, as not all these secretions are reabsorbed. Bile is the main form of B12 excretion; however, most of the B12 secreted in the bile is recycled via enterohepatic circulation. Excess B12 beyond the blood's binding capacity is typically excreted in urine.[18] Owing to the extremely efficient enterohepatic circulation of B12, the liver can store several years’ worth of vitamin B12; therefore, nutritional deficiency of this vitamin is rare. How fast B12 levels change depends on the balance between how much B12 is obtained from the diet, how much is secreted and how much is absorbed. B12 deficiency may arise in a year if initial stores are low and genetic factors unfavourable, or may not appear for decades. In infants, B12 deficiency can appear much more quickly.[64]

The liver is able to store enough vitamin B-12 to supply the human body for an extended period of time. Most healthy adults store between 2,000 and 3,000 micrograms of vitamin B-12 in the body and only lose 3 micrograms each day. Although the body loses some of its vitamin B-12 via the formation and secretion of bile, some of the vitamin B-12 is reabsorbed, helping to limit total loss of vitamin B-12 each day.



that's 3 years without any exogenous b12

fresh Wrote:
-------------------------------------------------------
> The liver is able to store enough vitamin B-12 to
> supply the human body for an extended period of
> time. Most healthy adults store between 2,000 and
> 3,000 micrograms of vitamin B-12 in the body and
> only lose 3 micrograms each day. Although the body
> loses some of its vitamin B-12 via the formation
> and secretion of bile, some of the vitamin B-12 is
> reabsorbed, helping to limit total loss of vitamin
> B-12 each day.
>
>
>
> that's 3 years without any exogenous b12


Yeah but the ability to store and absorb B12 in most people has been destroyed due to previous lifestyle habits, so it may be necessary to supplement with B12 and probiotics for a limited period of time to restore proper functioning. If this process has been damaged, raw foods alone may not be enough to jumpstart the process again.

So what is the external source for vegans from which b12 can be stored for years.

Currently i am taking b12 forte but I wish I could make b12 culture at home myself.



Edited 1 time(s). Last edit at 03/30/2014 06:28PM by CommonSenseRaw.

" It is thought that in states of low B12 intake, absorption increases which can delay overt B12 deficiency, sometimes for 20-30 year (7). "



[veganhealth.org]

It is possible that some vegans can ward of overt vitamin B12 deficiency, and even mild B12 deficiency, through B12 production by bacteria in the small intestine.

[veganhealth.org]