do b12 injections make you feel better How Fast Does Injection Work How soon less tired after a B12 shot? The Truth About B12 Injections:
Description
Here are some tips to make your shots more comfortable, and so that they leave less of a mark: Dont inject the roots of body hair, or wounded or bruised areas

That's the rule, and it doesn't change based on payer

Human vaccines & immunotherapeutics
The need for vitamin B12 is increased by pregnancy and lactation

One, an intramuscular injection, is sold under the name Depo-Provera and can only be administered by a health care provider

The vitamin also supports metabolic activity within the muscle tissue, which may aid in injury recovery or chronic muscular dysfunction