Byetta: artificial exenatide Byetta is an artificially produced version of a certain protein that occurs in the saliva of a lizard-like animal. This is the protein exenatide . Exenatide is a protein that is very similar to GLP-1 . This is a human protein that has a regulating effect on blood sugar levels. However, Byetta is not insulin and therefore works differently from insulin and the well-known diabetes tablets. Byetta helps the human body produce the right amounts of insulin at the right time. How does Byetta work? Byetta is a protein, which means that the substance must be injected into the body through injections .