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How long you feel the effects can depend on your starting levels, which is why people with a larger deficiency sometimes notice the benefits over a longer stretch
It is crucial to have a proper diagnosis before beginning B12 supplementation to avoid overuse or unnecessary treatment
Still, more is not automatically better, and frequency should be guided by a licensed provider who knows your history
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For people who are low in B12, yes, many feel a real lift in energy once their levels come back up
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