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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
The honest bottom line How long your injection lasts is set by your biology, not by a wellness package
Physically, you might feel weak, dizzy, or notice a strange tingling or numbness in your hands and feet
Energy metabolism
It's incredibly difficult to "overdose" on B12 because your body efficiently removes what it doesn't use
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