Totally safe: There is no known toxic dose of Vit B12 so you could take the whole bottle at once without problem (though not recommended). There is a limit as to how much B12 we can absorb so you will only absorb a small fraction of what you take. For many people methylcobalamin is a better choice than cyanocobalamin. See http://tinyurl.com/oc8up5z http://tinyurl.com/zl7phnm and http://tinyurl.com/ofaclgs
Answered 6/9/2017
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