Abstract: The present disclosure relates to nutritional composition(s) containing a protein equivalent source which includes a rice protein hydrolysate, and an octenyl succinic anhydride (OSA) modified starch emulsifier. The disclosure also relates to method(s) of producing rice protein hydrolysate, the method(s) including suspending rice protein in a solution to form a suspension; heating the suspension; cooling the heated suspension; adding an endoprotease to the suspension to hydrolyze the rice protein into at least two supernatant fractions; inactivating the endoprotease; separating an insoluble portion of the suspension from the at least two supernatant fractions; collecting the at least two supernatant fractions; and combining the at least two supernatant fractions.