A process for the production of 5-hydroxy-1-methylimidazolidin-2,4-dione, characterized in that a brominated product of 1-methylhydantoin is hydrolyzed.Un procedimiento para la produccion de 5-hidroxi-1-metilimidazolidin-2, 4-diona, caracterizado porque se hidroliza un producto bromado de 1-metilhidantoina.