Only if continued: B6 is the only b vitamin known to be toxic, but one has to take at least 250 mg (and usually at least 500 mg) a day for several months before this occurs; the problem it causes is peripheral neuropathy and it is reversible after you stop it. See http://ods.Od.Nih.Gov/factsheets/vitaminb6-healthprofessional/.
Answered 6/8/2016
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