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Improved Absorption Vitamin B12 injections bypass the digestive system entirely, which allows the vitamin to be directly absorbed into the bloodstream

Cyanocobalamin is excreted in the breast milk of nursing women in levels similar to the level of vitamin B12 in maternal plasma

Easy measuring: At 100 mg/mL, 1 unit = 1 mg on a U-100 syringe, so the dose in milligrams equals the dose in units verify units = dose concentration before drawing

Common clinical drivers include: Vitamin B12 deficiency Folate deficiency Chronic liver disease Alcohol use disorder Medications (e.g., methotrexate) Bone marrow disorders Chronic inflammatory disease Hypothyroidism Key ICD-10 principle: Cell size is a laboratory observation

In practice, injections are used when rapid correction or assured absorption is needed