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The 2-4 week window is not a hard cutoff
Eggs are also high in vitamin B12, but yolks have higher amounts of B12 than egg whites, with the B12 in yolks being more easily absorbed by the body
Misidentifying the measurement edge of the plunger, miscounting gradation marks, or confusing unit and ml scales all introduce systematic errors
The frequency of B12 injections varies based on individual needs: For deficiency correction: Injections may be administered more frequently, such as weekly or monthly, until levels normalize. For maintenance: Once adequate levels are achieved, monthly injections are typically recommended
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