what is b12 injection called Vitamin Injection: Energy Boost and Anemia Treatment — Mountainside Medical Vitamin B12 Injection – Manufacturer
Description
Pinch your skin, insert needle straight in and inject the medication

So injecting beyond a certain point may cause your cells to fight off the excess B12 so hard that it might reduce the amount of active cellular B12 - probably not to dangerous levels, but possibly sufficient to trigger some symptoms

When collagen builds up under the skin, it may thicken and form a tight cord under the skin

Studies suggest there is no difference in efficacy between the different delivery methods
