In that case, likely, a registered nurse (RN), licensed vocational nurse (LVN), paramedic, or physician assistant is the one inserting the line, not a phlebotomist
That is an incredibly tiny volume
Renal function tests are important, as GLP-1 receptor agonists can occasionally affect kidney function, particularly in patients with pre-existing renal impairment or those experiencing severe gastrointestinal side effects leading to dehydration
Test the support system before making a purchase
As you say you've " tried oral B12, which made no difference " it may well be that you have an absorption problem and will need injections
Once you are comfortable preparing a syringe, rotating sites, and properly disposing of needles, other SubQ vitamins and nutrients can feel less intimidating