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3 studies scored six, indicating medium-quality studies with a moderate risk of bias
Allergic Reactions: Although rare, some people may experience itching or a rash
The uMMA test may be more useful than the serum MMA test, because people with B12 deficiency and neurological damage excrete significantly more uMMA than those without damage
When administered under the supervision of medical professionals, Vitamin B12 injections are exceptionally safe
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