what do vitamins b12 injections do are the benefits of injection? Benefits of Vitamin B12 Injections

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The published research on oral B12 bioavailability consistently shows around 1% absorption meaning of a 1000mcg oral dose, only about 10mcg actually reaches your cells

This test is therefore particularly informative and can detect a vitamin B12 deficiency , even if your serum B12 level is still within the normal range

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Table 2 shows the results of the measurements before and after treatment with vitamin B12 nasal drops