I have always done B12 injections I.M. My Girlfriend started to do it Subcutaneous, got the needle in (a 1ml TB Syringe) and it started burning real bad. She only got about 0.1cc in her and withdrew the needle. She got a pea size black and blue bruise at injection site. She read on the internet that you can do B12 injections subcutaneous. Is this not true?