A Study to See Whether a Nutritional Supplement is Beneficial for Patients With Pancreatic Cancer

Inclusion Criteria: * Patients with a newly diagnosed pancreatic tumor thought to be pancreatic cancer scheduled for resection of the tumor. * Patients with a newly diagnosed pancreatic tumor thought to be pancreatic cancer, subsequently found to have biliary or ampullary cancer upon full pathological review, scheduled for resection of the tumor. * Patients with a CT image, which includes scans of the 3rd lumbar region, taken within 45 days before tumor resection surgery. * Ability to maintain oral intake. * Ability to give written, informed consent. Exclusion Criteria: * Patients found to have a diagnosis other than pancreatic, biliary, or ampullary cancer upon full pathological review. * Patients with a benign tumor. * Patients taking drugs that modify muscle metabolism. * Patients with uncontrolled jaundice. * A compliance rate of \<80%, excluding compliance during recovery from tumor resection surgery while in the hospital. * Patients currently taking the nutritional supplement being investigated in this study. * Patients in the placebo group who have plasma levels of the nutritional supplement components within the range of the nutritional supplement group at study time points when plasma levels of the nutritional supplement components are significantly higher in the nutritional supplement group versus the placebo group. * Inadequate specimens. * Known allergy to gelatin or glycerin.