Food security remains a key challenge in many Sub-Saharan African countries and in Kenya in particular. Despite the astonishing improvement achieved in the last decades, still a relevant share of the population lives below the minimum level of dietary energy consumption. Kenya addresses this concern with a noteworthy policy mix, aiming at giving to the agricultural sector a leading task in improving food security. In this paper, through a Computable General Equilibrium (CGE) model specifically modified for the context of developing country analyses, we address the impacts of three input policy options with reference to increases in fertiliser use, seed quality and irrigation investment. For the purpose of the study, a desegregated version of a 2014 Social Accounting Matrix (SAM) has been developed for Kenya. First results of simulated policy changes present overall positive effects on key food security aggregates related to food availability and access. Nevertheless a more careful analysis at regional and household type levels is required in order to draw wide-ranging policy recommendations.