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Chronic heavy alcohol consumption impairs B12 status through poor dietary intake, malabsorption, and liver disease
Typically, B12 can be administered either intramuscularly or subcutaneously
A 150 mcg dose = 0.045 mL = about 45 units on a U-100 syringe
An IM injection delivers medicine directly into a muscle rather than under the skin, allowing faster absorption and avoiding some of the delays or limits of oral or subcutaneous routes
However, certain circumstances warrant medical review and potential investigation
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