Vitamins and Coenzymes
The disease Beriberi is due to a dietary deficiency in

vitamin B12
vitamin B2 (riboflavin)
vitamin B1 (thiamine)
vitamin B6 (pyridoxine)

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Vitamins and Coenzymes
The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become

more deep in color on reduction with Zn in acid and regained its color on re-oxidation
more deep in color on oxidation and regained its color on reduction with Zn in acid
colorless on reduction with Zn in acid and regained its color on re-oxidation
colorless on oxidation and regained its color on reduction with Zn in acid

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