NaturVet Digestive Enzymes with Prebiotics & Probiotics contain a source of: Alpha-Amylase which can hydrolyze starch. Protease which can hydrolyze proteins. Cellulase which can break down cellulose. Lipase which can hydrolyze triglycerides. Prebiotics (FOS) help to support your pets naturally occurring beneficial bacteria. Probiotics contain a blend of live/viable naturally occurring microorganisms recommended to help support a healthy digestive tract and maintain a healthy immune system.