Vitamin I, also called vitamin B7, was a factor extracted from rice polish.
Its deficiency caused digestive disorders in pigeons. It is not
established that this applies to humans. •
The term "vitamin B7" was later reused by
some researchers to denote biotin.
Vitamin I is an old term for biotin. The term "vitamin I" was also used as an old term for vitamin B7. The term "vitamin I" was proposed for an undiscovered substance composed of vitamins A and E that was formed internally in the body. This was based on observations that both vitamins have many similar effects. Later, this theory was dropped. The similar effects noted for these and other vitamins may have been the antioxidant activity, which is exhibited by many substances. The term "vitamin I" was also used by a few researchers to denote biotin.)
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