what size syringe for b12 injections needle im injection Is this the right size needle for im injections? : r/B12_Deficiency Needle Size for a B12

doi: 10.1016/j.cell.2010.10.002

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

Rotate between sites to prevent tissue changes from repeated use of one location

Check to make sure that you can push a syringe through the slits but that the slits are not wide enough for little fingers get through

Thats where methylcobalamin steps in

The 2025 Prohibited List and WADAs explanatory note on the modifications can be found here