Abstract
Hourly fluctuation of riboflavin contents in breast milk after oral, subcutaneous or intravenous administration of the vitamin to healthy women was examined. Greatest fluctuation was observed with intravenous injection and lowest with oral administration. The behavior of riboflavin administered subcutaneously resembled that with intravenous injection. Riboflavin contained in milk for 5 hours was only about sixtieth of the vitamin excreted in urine for the same hours. Consequently, the fluctuation of riboflavin contents in breast milk after administration of the vitamin seemed to be small, but marked.
