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Medical Conditions Leading to Deficiency Several medical conditions interfere with B12 absorption, making b12 injections a necessary treatment
The injection : administered into your deltoid (upper arm) or, occasionally, the upper outer hip, by a licensed nurse practitioner or trained medical assistant under nurse-practitioner supervision
Thus, the RDA assumes an absorbed amount of 1.2 g per day (50% of 2.4 g) or 8.4 g per week
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