Before I was diagnosed with Bipolar my doctor started giving me weekly injections of B-12 I never really knew why at the time, I was drinking very heavily and had depression etc, it sounds like she made a wise decision. The B-12 injections had an instant impact in the sense that I would be feeling the positive effect by the afternoon, more energy, lift in mood etc. Obviously they were no replacement for an accurate diagnosis and in my case medication, however your post certainly has merit, I would love to explore the possbility of reducing my meds over time and I might take a more serious look at this and other treatments mentioned on this site. Thank you for sharing