Serious side effects are rare but can include allergic reactions (rash, swelling, difficulty breathing) or, in very specific cases of severe anemia treatment, low potassium levels
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doi:10.1016/S0076-6879(71)18006-8
We source our B12 from reputable medical suppliers, so you receive a pure, sterile product held to pharmaceutical standards rather than a supplement of unknown origin
In short, giving B12 to special groups needs a careful plan