Objective This study aimed at the promnestic effects of marine collagen peptide(MCP) in aged C57BL/6J mice.Method 20-month old female C57BL/6J mice were divided into aged control group and three MCP-treated groups.The effects on cognitive function,hepatic antioxidative systems and hippocampal morphology were studied after feeding aged mice MCP[0.22%or 0.44%or 1.32%(wt/wt) in diet]for 6 months.Cognitive functions were assessed using Morris water maze,step-down test and shuttle-box test respectively.Hippocamp...