What is the Best B-12 & How will it help me?

[TheMoth]

One of my friends mentioned to me that I may benefit from taking B-12. But, I learned a long time ago NOT to buy the generic vitamins found at Walmart or Walgreens.

Can anybody tell me about a good source of B-12? A supplement company that you trust... as well as the benefits of taking a B-12 supplement.

Just curious if this is something that would benefit me or not. Thanks!