Skin-care products made out of sake, soy milk, natto (fermented soybeans), and other common Japanese fare are now all the rage. Their popularity is thought to be an outgrowth of heightened public interest in healthy living. Facial cleansers and other skin-care products have become a focus of particular attention because they are applied directly to the skin. The trend is also being fueled by the ready availability of these goods at neighborhood drugstores and over the Internet and by their low cost.