Common technical errors that increase the risk of lumps include injecting too rapidly, failing to wait after injection, reusing needles, and injecting into the same site repeatedly
We use concentrated methylcobalamin at 5000 mcg/ml, the most active and bioavailable form of B12

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Deficiency is more common than excess vitamin B12, but both are worrisome
Additionally, she had indirect hyperbilirubinemia (4.4 mg/ml), low Vitamin B12 levels (44 pg/ml), normal serum iron levels and negative Coombs test