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As with any medical treatment, there are potential side effects to consider
Reported side effects are typically mildsuch as injection-site irritation, headache, or fatiguebut regulatory reviews highlight potential immunogenicity and uncertainties around long-term safety and product quality in compounded or nonapproved forms
Therefore, the exact prevalence of pernicious anemia is difficult to ascertain
So how to explain all the anecdotal evidence that seems to prove B12 works for so many
But if you saw yourself in any of the risk factors listed in Figure 1, then youll probably need to take supplements
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