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Typically, you can start to feel the positive effects of the IM shot, between 24 - 72 hours post injection, dependent of current levels of B12 in the body
Headache or nausea is uncommon
Use a cotton ball moistened with alcohol to stop any bleeding at the injection site and to clean the area
Symptoms like persistent tiredness, irritability, or nausea might indicate a deficiency, which is common in individuals with low dairy or meat intake
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