I received my hydroxocobalamin to inject IM. Just wanted to make sure of a couple things. I have previously been self injecting the cyanocobalamin form of B12. 1000 mcg/ml. Is the same dose okay for hyrdroxocobalamin IM? If I have been accepting the cyano form okay, I would assume as far as allergic reactions, that I should be fine with this form as well. I have read that it is very painful. I know to be slow and warm up the liquid, but is this true? Lastly, does everyone always draw back to check for placement. Could you tell if you hit an artery with the red B12? Do any of you find you need less frequent injections with the hydroxocobalamin form? I know it's a lot of questions, but any input would greatly be appreciated.