Vitamin B- 7, also called vitamin I, was a factor extracted from rice polish.
Its deficiency caused digestive disorders in pigeons. It is not
established that this applies to humans. •
or rice polish factor, but there is no known function for it and it is not isolated to a specific chemical form. It appears to be an obsolete term and is sometimes used to denote Vitamin B3a or Bw.
The term "vitamin B7" was later reused by
some researchers to denote biotin.
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