your B12... NASCOBAL?

Does anyone use nascobal ? if so do you like it? are there any side effects you are experiencing? I am trying to find out why this may be better than sublingual or if it is just a personal preference, or if it is the same thing??? anyone know? Im going to research it but just wanted to see if y'all had any thoughts on it too! :)

my surgeron just recomended that i should get the injection. every 2 months.  and to stop the sublingual `cuz is gonna be easier for me. so i`m doing my reserch aswel so let me know what does peopole say.
good luck!
hugs