Abstract
Soy peptide is absorbed rapidly into the living body, where it manifests diverse physiological actions. We conducted an interventional study on healthy adult women to evaluate the effects on skin function of a testbeverage composed of a combination of collagen peptide, which had previously been reported to increase skin elasticity and moisture, and soy peptide. A beverage composed of collagen peptide alone with a total peptide content equal to that of the test beverage served as the control beverage. Each subject was measured for the skin elasticity, skin moisture level and trans epidermal water loss (TEWL) before and after the 70-day beverage intake period. Although there was no statistically significant difference between the test and control groups in any parameter, the skin elasticity was significantly higher and TEWL was significantly lower than the pre intake levels after intake of the test beverage. However, the change of either of these two parameters was statistically significant after intake of the control beverage. These findings suggest that the intake of collagen peptide combined with soy peptide might have improved the skin elasticity and skin barrier function.（Received February 23.2011:Accepted in revised form October 12. 2011）
