Jenkins, and S.M
While vitamin B12 injections are predominantly safe, some individuals might experience side effects such as: Mild diarrhea Itching, rash, or redness at the injection site Headache, dizziness, nausea, or vomiting Swelling sensation, cough, or shortness of breath Chest tightness, rapid heartbeat, or blood clots (rare) Severe side effects, although infrequent, require immediate medical attention
Regardless of mechanism, clinical observations support a nausea-reducing effect in a subset of users
The tapeworm from undercooked fish ( Diphyllobothrium latum ) absorbs huge quantities of vitamin B 12 , and infested patients often have associated gastric atrophy
Avoid exceeding the pinch amount to prevent high sodium levels