how do b12 injections make you feel Why I Worse After My Injection? Causes & Management – Bolt Pharmacy B12 Shots vs. IV Infusions:

The effects of a B12 shot can last anywhere from one week to several months, depending on individual needs, metabolic rate, and underlying deficiency severity

Subcutaneous While less common, these injections are still an effective injection method where the needle is inserted just below the skin

B12 does not suppress appetite or block fat storage

Severe muscle weakness or cramping, which can be a sign of low potassium that needs treating

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