Do not recap the needle to prevent accidental needle-stick injuries
Snap the top off backwards: Figure C: open the ampoule Step 5
For intramuscular injections , which are common for administering Vitamin B12, needle lengths usually range from 5/8 inch to 1.5 inches
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)
Its also important for the formation of brain and nerve cells
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