Once absorbed, B12 binds to transport proteins called transcobalamins, which carry it to tissues throughout the body
For example, someone with severe B12 deficiency and neurological symptoms might need more frequent injections at first
However, the primary use of B12 injections around the world, and the main reason people need it so badly, is because of a disorder called pernicious anemia
Lowering the risk of type 2 diabetes, hypertension, and cardiovascular conditions
Some people might also want regular injections (weekly or monthly) to maintain top-rated B12 stages, which may affect the overall fee
In some cases, B-12 deficiency may reduce immunity (Patel, Cureus 2023