b12 injection side effect Are Vitamin Shots Right for You? Why Do I Feel Worse
Description
The GP would prescribe the correct amount for you, so it would be hard to overdose. But if too much vitamin B12 is taken, certain symptoms may arise - including a change to your pee

Vadadustat (AKB-6548)
A critical review
On the other hand, using a needle that's unnecessarily long for subcutaneous injections can cause unnecessary pain or injury

For maintenance, a patch may help
