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National Library of Medicine (PubMed)
Your body cannot synthesize vitamin B12, so you must obtain it through food or supplements
Optimal dosing varies based on body weight, body composition goals, and individual metabolic factors
Mild soreness or a quick energy buzz is about the extent of what anyone reports
However, any pain usually passes quickly and patients can usually resume their normal activities immediately after the injection
Importantly, this does not automatically mean injections oral supplements are appropriate for the majority of older adults
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