2005 Annual Report 4d.Progress report. This report serves to document work conducted under a Reimbursable Cooperative Agreement between Tufts University and the National Institute of Health. Additional details of this research can be found on the parent CRIS 1950-51000-065-00D Deitary Antioxidants, Aging and Oxidative Stress Status. There is no progress to currently report as funding was recently received for this project. Using well established in vitro assays for the antioxidant action of foods and phytochemicals, scientists in the HNRCA Antioxidants Research Laboratory will determine in vitro the antioxidant potential of approximately 50 botanical products. The antioxidant potential will be calculated from relevant dose-response experiments in each assay of the screening panel based upon the concentration of total phenolic compounds in each plant. Quality control processes and nutrient references, e.g., ascorbic acid, beta-carotene, alpha-tocopherol, and epigallocatechin gallate) will be proposed for this study.