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(Fortified is important because it ensures that thiamine levels are adequate.) Again, because excess B vitamins can be excreted, toxicity is extremely unlikely to be incurred
1 2 "Vitamin B12 production by Citrobacter freundii or Klebsiella pneumoniae during tempeh fermentation and proof of enterotoxin absence by PCR"
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Target: 5 mg once daily or 2.5 mg twice daily (BID)
However, for the last several years, B12 injections have been given to people without clinical deficiencies
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