Answer ( 1 )

  1. It depends on which B vitamin you mean.

    B6, for example, can cause peripheral neuropathy in very high doses. Too much B3 for long periods can cause liver damage.

    On the other hand, Vitamin B12 is administered for cyanide poisoning at doses about 2 million times the recommended daily amount. With no lasting effect.

    Water solubility is oft-quoted as the reason why B vitamins are safe. Hydrogen cyanide is water soluble.

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