Cyanocobalamin or hydroxocobalamin are most likely. And unfortunately, cyanocobalamin is the most likely of all.

I also developed nose bleeds. It took me a year, almost to the day, of B12 treatment to get rid of them (might have taken me less if the neurologist who diagnosed me hadn't been experimenting on me and kept me from B12 for at least 6 months after getting stores up good and strong).

rose