Vitamin B is a complex of several vitamins. The name arises because it was once
considered a single vitamin, much like Vitamin C or Vitamin D. Since later research
has shown it is in fact a complex of chemically distinct vitamins that happen to
often coexist in the same foods, the name has gradually declined in use, being
replaced by the generic term "the B vitamins", the vitamin B complex, or by the
specific names of each vitamin.
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