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However, allergic reactions to B12 shots are extremely rare

Although short needles are generally sufficient for GLP-1 injections, there are scenarios where slightly longer needles (e.g., 68 mm) may be considered: Individual body composition: Some clinicians may prefer a longer needle if a person has a thicker layer of subcutaneous fat, although research shows skin thickness itself doesnt vary drastically with BMI, and 4 mm still usually suffices

Regular use of MIC B12 injections, typically once or twice a week, may be necessary to maintain benefits

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