"Pancreatic and exopancreatic function of glucose‐dependent insulinotropic polypepide (GIP) and glucagon‐like peptide (GLP)‐1. GIP acts directly on the endocrine pancreas, bone, fat, gastrointestinal (GI) tract and brain. GLP‐1 acts directly on the endocrine pancreas, gastrointestinal tract, heart and brain." From Figure 2 in https://pmc.ncbi.nlm.nih.gov/articles/PMC4020673/.
Seino Y, Fukushima M, Yabe D; ''GIP and GLP-1, the two incretin hormones: Similarities and differences.''; J Diabetes Investig, 2010 PubMedEurope PMCScholia