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For an intramuscular (IM) injection, the usual choice is a 22 to 25 gauge needle, 1 to 1.5 inches long
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References Sikiric, P
This helps the body absorb and use it better
In cases of documented vitamin deficiency, the regimen could be an initial intensive phase (like 2 mL IM three times a week for 2 weeks) followed by reevaluation
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