There is no vitamin B. There are a group of B vitamins. B12 (cyanocobalamin) is one of the B vitamins. There is also B1 (thiamine), B9 (folic acid) and so on. If you want a Vitamin B, you would buy vitamin B complex which is all the B vitamins. If you want just B12 because you are deficient then look for bottles that only say B12 or cyancobalamin.
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The 11 other B's