b12 injections sleepy Feeling worse after Injection: Answering concerns When Do You Feel Less
Description
Facial twitching There is evidence that low levels can also cause facial twitching, which is likely to occur as the nerves in the face become progressively damaged

The most common is injecting too quickly, which creates a pocket of medication that absorbs slowly and forms a temporary nodule

lead/fluorine/oxalic acid poisoning (as an adjuvant therapy in combination with other treatment)
Its also possible that a crash follows the initial boost of energy as the body adjusts to the sudden influx of B12
