One should always buy Pas Yisrael bread - Jewish baked kosher bread - whenever possible. Pas Palter - bread produced in a non-Jewish commercial bakery with kosher ingredients - may be purchased when no similar Pas Yisrael product is readily available. Bread which is not kosher certified is not permitted because it may be made with fats, emulsifiers or improvers of animal origin. Release agents used to grease production equipment may be non-kosher and the equipment itself may be used for non-kosher products. See KLBD supervised bakeries.