By visualizing age-dependent changes in internal skin elasticity, the research team of Shiseido, Honda Electronics Co., Ltd. and Toyohashi University of Technology, observed that while females in their 20s had relatively even skin elasticity, the elasticity in females in their 30s started to decrease in the papillary dermis, and aging alteration was further developed in one's 40s. The team also studied how the variations in skin elasticity in the papillary dermis would change the look of the skin and discovered that the skin surface of females without any signs of variations in elasticity was more likely to be smooth, whereas that of females with decreased elasticity looked slightly rough.
The team has found out that type III collagen is abundant in the areas with healthy skin elasticity in the uppermost layer of the dermis, but it decreases in the parts where the skin elasticity has deteriorated. This suggests that the decrease in type III collagen triggers the decrease in skin elasticity.
Watercress (Nasturtium officinale) is a highly nutritious vegetable rich in vitamins, particularly beta-carotene, and is claimed to have anticancer and arteriosclerosis prevention effects. Shiseido has discovered that watercress extract works on the dermal cells and promotes the production of type III collagen.