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Overdosing can lead to elevated B12 levels and potential side effects, while underdosing may not adequately address symptoms
Vitamin B12 side effects Side effects from vitamin B12 supplementation are rare, and only occur with B12 injections, not oral supplementation, Allen says
The reason: since the fragment contains only the C-terminal part, it lacks the binding domains for GHR (most of the affinity of hGH for GHR lies in the central part of the molecule)
Low vitamin B12 can be linked to diet, problems absorbing the vitamin, certain medicines, surgery or other medical conditions
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