still feeling tired after b12 injections Why Do I Feel Worse My Injection Feeling worse after B12 Injection:

Benzyl alcohol inhibits bacterial and microbial growth and microbial growth, extending the shelf life of reconstituted vials and reducing contamination across multi-dose use

After this initial period, injections are usually reduced to a maintenance schedule, typically administered once every one to three months, based on continued monitoring of your health status, symptoms, and follow-up blood tests

It replenishes mitochondrial energy in neurons and re-regulates the circadian clock (via SIRT1/CLOCK), normalizing dopamine synthesis in the nucleus accumbens to reduce cravings and withdrawal anxiety

I also have fibromyalgia so it is really hard to figure what is causing what with me. I really would like to know if B12 at 4000 can be harmful or be a sign of something being wrong