B12 shots supply vitamin B12 as methylcobalamin or cyanocobalamin, typically given intramuscularly into the deltoid, supporting red blood cell formation, myelin and nervous system health, and the metabolism of homocysteine, a process that can falter with vegan diets, malabsorption, or medications like metformin
Vitamins B5 and H have reported to cause life-threatening adverse reaction of eosinophilic pleuropericarditis and patient history for such allergy should be checked before administration (36)
If you're taking antibiotics such as chloramphenicol, colchicine, folic acid, methotrexate, and para-aminosalicylic acid, your doctor may have to monitor your condition for any possible side effects
The needle should be inserted into the pinched skin in a smooth, quick motion
B12 deficiency can make you feel unusually irritable, anxious, or down