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În prealabil postat de AlinB
Brewer's yeast does not contain vitamin B12, an essential vitamin found in meat and dairy products. Vegetarians sometimes take brewer's yeast mistakenly believing that it provides B12, which can be lacking in their diet.
http://umm.edu/health/medical/altmed.../brewers-yeast
Insa mai trebuie cautate surse de informatie.
Depinde se pare si de procesul tehnologic.
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Exista ceva vegetal care are cantitati mai mari de vitamina B12 chiar decat ficatul (cu 250%), este spirulina care se gaseste la orice magazin naturist.