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Allergic Reactions to Vitamin B12 Components Vitamin B12 is usually safe, but some people might have allergic reactions to it
Healthcare providers must weigh the severity of the deficiency against the patients overall health
This 1,000 mcg initial loading dose protocol quickly fills up vitamin B12 stores
There are no other absolute contraindications reported for hydroxocobalamin use in deficiency states, but caution is advised in individuals with conditions such as early Lebers optic neuropathy (a rare hereditary optic atrophy) due to the theoretical risk of worsening vision
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