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But this leads to a fundamental question many ponder: does B12 shot help with fatigue

This elevation in NAD+ levels activates critical metabolic pathways including SIRT1 (sirtuin 1), a longevity-associated protein that regulates insulin sensitivity, mitochondrial function, and cellular stress resistance

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Control mice, by comparison, gained 1.4% over the same period

The benefits of a single B12 shot usually last about one to two weeks

Administration via intramuscular (IM) injection