are there any side effects from having b12 injections What Happens When You're Allergic to Vitamin Vitamin B12 Side Effects: Risks

Children presenting neurological signs or symptoms, those unable to take oral medication, individuals with known malabsorption syndromes, infants under 6 months old, and patients using medications that may interfere with vitamin B12 absorption are typically treated with a parenteral protocol (1)

Doctors consistently deny them from pernicious anemia patients and people with other absorption issues

Physical State: Tablet form for precise experimental dosing

Clinical guidance for intramuscular injections points to a 22 to 25 gauge needle, given at a 90-degree angle, with the length chosen so it reaches muscle without going too deep