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This critical micronutrient is not produced by the body and must be obtained through diet
This matters because many adults with low B12, whether from dietary restriction, aging, or conditions like pernicious anemia, cannot absorb enough B12 through food or oral supplements alone
Effects from a B12 injection can last several weeks to months, depending on your absorption rate, metabolism, and severity of B12 deficiency
Results may very person to person.
Another reason might be purely to help you lose weight and burn fat more quickly
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