Studies on the Urinary Excretion of Riboflavin

Abstract
The riboflavin content of 658 urine specimens has been determined. Evidence is presented that the riboflavin per milliliter of urine is a more constant value than others which have been used in expressing riboflavin excretion. Saturation tests seldom give more information than can be obtained by analysis of a fasting morning specimen. There is a widespread incidence of riboflavin deficiency in this area.