I had a very bad reaction to this... and in reading online, I am not the only one... can cause high levels of anxiety and even panic attacks... after-effects last awhile... so talk to your Doc before taking!
Many may be able to take with no side effects, but better safe than sorry!
Safest and most natural formulation of vitamin B-12
Hydroxocobalamine is the most natural formulation of Vitamin B-12. More often it is compounded with cyanide or methylene, both of which are poisonous. Supposedly it is safe in such small amounts. But I prefer the hydroxocobalamine.