An infant formula based on high protein rice flour, with added lysine and threonine, was evaluated in recovering malnourished infants. Acceptability, tolerance, and the digestibility of most major nutrients (energy 93.9 ± 0.7%. fat 96.9 ± 0.3%. carbohydrate 96.8 ± 0.6% of intake) were excellent. Digestibility of protein, as with all rice products, was moderately low (80.1 ± 3.3%), but its high biological value made N retention equal to that from casein. Plasma-free amino acids were consistent with the low essential/total amino acids ratio found in cereals, with slower absorption, and with the possibility that leucine was the first-limiting amino acid. Absorptions of Ca, Mg, P04, and Zn were considered satisfactory. Energy costs of weight gain and the estimated percentage N in the weight gained during 14 days were comparable to those attained with the highest quality cow's milk-derived formulas in children of similar ages and nutritional status. © 1990 Raven Press Ltd, New York.