My husband (bless him) injects me every other day now with 1ml hydroxocobalamin and it hurts like billyo. He has injected me with 2ml of cyan(1ml B12) while on holidays in Spain and France and that didn't hurt. .
The vials are warmed by me first and I prepare and load the injection he sticks it into me gently and presses slowly.
Any advice would be gratefully received.