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Summary: B12 injections begin working at a cellular level immediately, though noticeable symptom improvement typically occurs within 4872 hours to several weeks depending on deficiency severity
The investigators informed patients or their surrogates concerning the study orally and written informed consent was given before entry into the study
Additional information Publisher's note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations
Starting at the lower end allows assessment of individual tolerance before increasing if needed
Appetite and food relationships may shift
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