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Riboflavin is a yellow crystalline compound C17H20N4O6 of the vitamin B complex that occurs both free (as in milk) and combined (as in liver) as a component of coenzymes (such as FMN) which are essential to normal metabolism – called also vitamin B2.
Riboflavin comes in three sizes for the 4x4, 5x7 and 6x10 hoops.
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