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The dosages seem to be more along the lines of 150mcg-300mcg whereas many of the pill forms are 25mg-50mg
However, the B12 itself can stay in your system longer, with effects on red blood cell production and nerve health lasting for weeks or months, depending on your deficiency and injection frequency
9 NCBI BookshelfBest practices for subcutaneous injection: aseptic technique and site rotation
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But what defines someone as well nourished? How do you know if you could be deficient in B12
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