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- Vitamin B8 redirects here. For the non-vitamin nutrient sometimes termed "Vitamin B8", see Inositol.
Ergadenylic acid, or Vitamin B8, is a vitamin essential to humans consisting of the nucleic acid adenylic acid. Its deficiency decreases RNA synthesis, as well as ADP and ATP synthesis. A deficiency will inhibit the breakdown of food into energy and deteriorate hormone functions. This substance was not widely recognized as a required vitamin until recently, and, for this reason, the term "Vitamin B8" was also used by some researchers to denote inositol.
