reactions to vitamin b12
Nervous System Reactions. After getting a vitamin B12 injection some people may experience a disturbance to the nervous system. These symptoms may include dizziness, difficulty walking normally, nervousness, anxiety, weakness and uncoordinated movements.lthough it is a rare occurrence, an allergic reaction may occur following a vitamin B12 injection. The reaction is thought to occur due to impurities in the B12 injection, notes Drugs.com.
Some people may experience reactions in the gastrointestinal tract after getting a vitamin B12 shot. Some side effects associated with the injections include nausea, vomiting, indigestion and mild diarrhea, according to Drugs.com.lthough it is a rare occurrence, an allergic reaction may occur following a vitamin B12 injection. The reaction is thought to occur due to impurities in the B12 injection, notes Drugs.com.