Professional Administration : While some people are trained to administer B12 injections themselves, many prefer to have them administered by a healthcare professional, which can be inconvenient and time-consuming
Perluigi M, Sultana R, Cenini G, Di Domenico F, Memo M, Pierce WM et al
Some People Have Problems with Absorption Some health conditions such as Crohns Disease and Celiac Disease can prevent the proper absorption of vitamins and nutrients, even when its given in an injection
A few things to note: yes, it has a sulfuric scent (dont freak out, it fades in about 30 seconds), and the best place to apply it is on an area with little to no hair, like your stomach