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Some people may be allergic to certain compounds in cyanocobalamin, making them unsuited for the injections.
These figures come from preclinical and pharmacokinetic literature, not from approved human dosing and note the standard route for this molecule is oral

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Therefore, taking a 5000 mcg dose yields about 50 mcg of absorbed B12, which is vastly higher than the daily requirement of 2.4 mcg
