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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
Better NAD+ levels also support healthy insulin signaling
^ Khan,AG and Easwaran,SV (1976)
However, certain circumstances warrant medical review and potential investigation
Chronic heavy alcohol consumption impairs B12 status through poor dietary intake, malabsorption, and liver disease
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