Mean urinary excretion rates, mg/hr, (z-axis) of riboflavin (A), daidzein (B), and genistein (C) after ingesting each of the four study pills (y-axis). Urine collected during baseline and at timed intervals after pill ingestion is shown on the x-axis. Each subject (n=6) ingested a total of 32 mg riboflavin, 0.243 mmole of daidzin, and 0.222 mmole of genistin once every day for four days. Comparisons among each time point of an analyte after four different daily doses by repeated measures ANOVA showed no difference (all P>0.05).