Source Naturals Rejuvenzyme is a blend of proteolytic enzymes - like bromelain, papain, and pancreatin - meant to be taken on an empty stomach so they work systemically in the body rather than just on food. Taken this way, they're commonly used to support a healthy inflammatory response, joint comfort, and recovery from exercise or minor strains. Don't take it if you're on blood thinners without talking to your doctor first, since several of these enzymes can affect clotting.