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Table of Contents How Long Does It Take for B12 to Work
Gut-related applications often show improvement within 1-3 weeks
The researchers reported improvement in more than 80% of the patients, but there was no control group
Because B12 supports healthy cell production, the deeper benefits to nerve function continue to build slowly over this period
The B12 component may help if low B12 is contributing, though much of this early tiredness comes from the calorie drop itself and tends to ease as your body adjusts
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