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One of the most profound mechanisms of action is B12's ability to actively support the maintenance of the myelin sheath
The injectable versus oral comparison helps researchers evaluate route tradeoffs
If tiredness is caused by poor sleep, stress, anaemia from another cause, thyroid problems, depression or another condition, B12 may not solve it
After initial correction, some individuals may require ongoing maintenance injections (often monthly) if they cannot adequately absorb B12 from diet or oral supplements
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