Ibikomoka ku muceri ni intungamubiri zikurwa mu muceri wumuceri, igice cyumuceri. Umuceri wumuceri, ibikomoka ku gutunganya umuceri, ukungahaye ku ntungamubiri zitandukanye ndetse n’ibinyabuzima. Ibikomoka ku muceri bikungahaye ku ntungamubiri zitandukanye, harimo: Oryzanol, itsinda rya vitamine B (harimo vitamine B1, B2, B3, B6, n'ibindi) na vitamine E, beta-sitosterole, gamma-glutamine. Umuceri wumuceri witabiriwe cyane kubwubuzima bwawo, cyane cyane mubijyanye ninyongera zubuzima nibiribwa bikora.