The Committee on Nutrition has reviewed the interesting letter from Drs. Naiman and Oski regarding the Committee Report, "Appraisal of Nutritional Adequacy of Infant Formulas Used as Cow Milk Substitutes." In this letter they call attention to a discrepancy between their own values for folic acid (60 µg/qt) and those mentioned in the Committee report (2 µg/qt). The Committee is aware that the S. fecalis assay is quite low in comparison to the L. casei assay, whereas bioassay values are intermediate. The complexity of the problem is obvious from the following letter by Drs. Luhby and Cooperman.