So much misinformation! Ah, this is typical from supplement companies. Is vitamin B-12 an important supplement? It depends on how old you are. Whenever I want the lowdown on any kind of supplement, I can almost always find a very, very detailed analysis at the Linus Pauling Institute at Oregon State University. Scan this essay to get all of your questions answered about this all-important vitamin for the HCG diet protocol.
One major disappointment that I had early in my career in plant natural products chemistry was finding out that this vitamin is not derived from plants. Bacteria make plenty of it, though. If your friendly intestinal bacteria are healthy, you are probably getting at least a minimum amount into your system. However, the older you are, the more you will have to get of this vitamin from outside sources. Indeed, I found that 2500 to 5000 mcg helped me with low energy during the HCG protocol. Clinics that offer injections of B-12 are even better.