route of vitamin b12 injection sites + How to use B12 Shots Safely How to Administer an Intramuscular

A doctor will inject the shot into the muscle or deep into the skin

Yes absolutely

If the intestines find it difficult to absorb and break down vitamin B12 from food sources, it can cause a deficiency

This is a separate and still investigational line of research rather than an established use, and it should not be confused with the fat-loss mechanism that the bulk of the clinical work has focused on

It also plays a role in maintaining the myelin sheath that protects nerve cells and ensures smooth nerve transmission

Vegetarians and vegans are advised to consume fortified foods or take B12 supplements to maintain adequate levels