Assessment of Gastric pH Changes Induced by Ascorbic Acid Tablets

Inclusion Criteria: * Healthy, young males age 18-30 years with no prior history of gastrointestinal disease or symptoms. Exclusion Criteria: * Hypochlorhydria (baseline use antacids, antisecretory medications, or surface agents including proton-pump inhibitors, H2 blockers, or sucralfate). * Current or previous history of gastrointestinal disease including gastroesophageal reflux disease, Barrett's esophagus, peptic ulcer disease, dyspepsia, gastroparesis, bacterial overgrowth, microscopic colitis, gastric intestinal metaplasia or metaplastic atrophic gastritis, gastric neuroendocrine tumors, helicobacter pylori infection, inflammatory bowel disease (Crohn's disease or ulcerative colitis), celiac disease, visceral cancer, chronic infectious disease, immunodeficiency, uncontrolled thyroid disease, history of liver disease). * History of gastric bypass or other abdominal surgeries excluding cholecystectomy or appendectomy \> 6 months prior to study initiation. * Radiation therapy to the abdomen. * Pregnant females. * Ingestion of any prescription, over-the-counter, or herbal medications which may affect study interpretation. * Currently a smoker * Antibiotic use within the last 3 months