b-12 comes in different forms and different viscosities but the thinner aqueous form can be injected with a tiny needle that is near-painless. the thicker longer-lasting solutions may require a slightly bigger needle but they are not that bad. don't worry. why is your doctor suggesting b-12? there needs to be a real medical reason.
what size needle is used for b-12 injections. i am terrified of needles and dr wants to give me b-12 injections