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If blood tests show clearly low levels (thresholds vary by lab, but often below roughly 200 pg/mL) or there are signs of anemia, a provider may recommend weekly injections for the first several weeks as a correction or "rescue" phase
Low B12 has been associated with sleep disturbances and with mood symptoms such as low mood or anxiety, and correcting a confirmed deficiency may help some people in these areas
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This includes mitochondrial function, DNA repair, and the ability to clear out senescent cells
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