A Comparison of Riboflavin Synthesis and Excretion in Human Subjects on Synthetic and Natural Diets

Abstract
Three normal women were maintained for 7 weeks on a synthetic diet containing 1.09 mg of riboflavin per day. This diet was followed, after a month's respite, by a diet of natural foods containing 1.33 mg riboflavin per day. Throughout the study 24-hour urinary excretions of riboflavin were determined, and during 2 weeks of the time on the synthetic diet, 1-hour fasting excretions were also measured. Fecal riboflavin excretions were measured by 5-day periods. The results may be summarized as follows:

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