your report is correct but try not to take it too far..B12 is essential for electrical signals between nervous cells, of course it has a massive impact on depression and anxiety, bare in mind that depression is more complex and also don't forget the that vitamin D has a massive role in increasing or decreasing the depressive mood. i suffered my entire life with depression, but now with medications life is much better. sorry to take long from your time, keep up the effort and good work.