Locally it was hard for me to find just plain B-12. I found a complex, but B-12 was the last ingredient. I feel positive effects with the B-12 shot when I was hospitalized last year but I didn't realize how much until I lost that in my system. I went back to my pychiatrist (I'd stopped seeing her because of a bad experience in her office but my dr's replacement refuses to handle my meds so back I went) and she prscribed me the shots. I just have to hunt down needles now.