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Consider supplementation if dietary intake seems inadequate
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If handled, use a fine insulin syringe: vendor guides specify a 2931 gauge, 1/2-inch insulin syringe for subcutaneous administration
Standard reconstitution uses 2mL bacteriostatic water per 5mg vial, yielding a concentration of 2.5mg/mL or 2500mcg/mL
The ideal injection site depends on your age and the comfort level of the person administering the injection
Laboratory evidence: A serum B12 level confirming deficiency, or prior documentation of intrinsic factor antibodies for pernicious anemia
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