Possibly: People occasionally develop allergies to certain brands of vitamin supplements. It is not likely to develop an allergy to vitamin B12 itself.
Answered 12/26/2018
6k views
Other contents: B12 preparation contains other chemicals also and you may be allergic to one of those contents. Your doctor may prescribe you a different brand to avoid negative reaction.
Answered 1/3/2019
233 views
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