Yes your liver can store some amount of B12, but how much for a particular individual is unknown. The problem is if you are just living off your reserves you are storing up trouble for some indeterminate point in the future.
A lot of vegans like the idea that their diet is naturally healthy and shouldn't require supplementation. However the consensus of the vegan community and the medical evidence show that B12 deficiency is a real risk for vegans who do not supplement.
There maybe cases of vegan's thriving without B12 supplementation, however these are in the minority and we don't know the specifics. Maybe they are highly efficient at processing B12, maybe they are consuming B12 supplemented foods without realizing it, maybe they are consuming food contaminated with B12 producing bacteria.
It may be, as some suggest, that most healthy individuals don't require B12 supplementation and all cases of B12 deficiency in humans are due to some other confounding factor.
However according to the CDC, 1 in 31 adults 51 years of age or older have B12 deficiency. So it looks like those confounding factors are pretty common. B12 deficiency is not just a problem for vegans, but vegans are putting themselves at higher risk without supplementation.
Supplementation with B12 is safe and easy, B12 deficiencies are common in the population and a B12 deficiency can result in permanent neurological damage, so it would seem that the sensible option would be supplementation.
Mark Osborne - www.VeganHealthAndFitness.com
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