The present invention relates to a composition for use in animal nutrition comprising a controlled release matrix and to a method for preparing said composition. Moreover, the present invention relates to a method for the treatment of monogastric animals in which said composition is used as addition of active substances such as for instance organic acids and/or inorganic acids for preserving and acidifying food for monogastric animals, including swine, sheep, rabbits, birds, horses, pets and humans.