Abstract: This application relates a flowable feed supplement for ruminant animals such as cattle comprising a liquid acid adsorbed on a granular inorganic substrate. The inorganic substrate may be combined with an organic carrier such as source of slowly fermentable carbohydrates. In one embodiment the inorganic substrate is silicon dioxide. The supplement provides a concentrated, palatable source of anions to help prevent hypocalcemia, ketosis and other diet-related metabolic disorders.